7.
In a food chain, concentrations of harmful substances increase in higher trophic levels in a process known as
A. biological magnification.
B. genetic drift.
C. biological succession.
D. pesticide resistance.
The A. Biological magnification is the process which causes toxic substances to increase at each trophic level in a food chain, making apex consumers most at risk.
The term that describes the process whereby toxic substances increase along trophic levels of an ecosystem is biological magnification. This phenomenon occurs when synthetic chemicals, such as pesticides, become more concentrated as they move up the food chain, resulting in higher levels of toxicity for organisms at the top. For instance, when a marsh is sprayed with DDT to control mosquitoes, microscopic aquatic organisms like plankton absorb trace amounts of DDT.
Filter-feeders such as clams and some fish then ingest the plankton, accumulating DDT in higher concentrations. This process continues upwards through the food chain, with each trophic level experiencing a significant increase in the concentration of these harmful substances, often resulting in detrimental effects on apex consumers.
What layer of the skin functions as padding and insulation and is responsible from some of the structural differences in men and women?
Is a guinea pigs unicellular or a multicellular?
List the steps that should be followed to clean and disinfect clipper blades effectively
To clean and disinfect clipper blades effectively, one should follow these steps:
1. Disconnect the Clipper: Before beginning the cleaning process, ensure that the clipper is turned off and unplugged from the power source.
2. Remove Hair and Debris: Use a clipper brush or a soft-bristled toothbrush to remove any hair or debris from the blades. Be gentle to avoid bending the blades.
3. Disassemble the Blades: If possible, carefully disassemble the blades according to the manufacturer's instructions. This allows for a more thorough cleaning.
4. Clean with Soap and Water: Wash the blades with warm, soapy water using a soft cloth or brush. This helps to remove any remaining debris and oils.
5. Rinse and Dry: Rinse the blades with clean water to remove any soap residue. Then, dry the blades thoroughly with a clean towel or allow them to air dry completely. It's important to ensure they are dry to prevent rust.
6. Disinfect the Blades: Apply a disinfectant solution that is suitable for use on metal and is safe for the type of blades you are cleaning. Follow the instructions on the disinfectant for the appropriate contact time. Common disinfectants include isopropyl alcohol, barbicide, or other EPA-registered disinfectants.
7. Rinse Again (if necessary): If the disinfectant requires rinsing after use, do so with clean water and dry the blades again thoroughly.
8. Lubricate the Blades: Once the blades are clean and dry, apply a few drops of clipper blade oil or a manufacturer-recommended lubricant to the blades. Turn on the clipper for a few seconds to distribute the oil evenly.
9. Reassemble the Clipper: Carefully reassemble the blades and any other parts that were removed during the cleaning process.
10. Test the Clipper: Plug in the clipper and turn it on to ensure that the blades are moving smoothly and that the clipper is functioning properly.
By following these steps, one can maintain the cleanliness and effectiveness of clipper blades, ensuring they are free from bacteria and other pathogens, and prolonging their lifespan. Always refer to the manufacturer's guidelines for specific instructions related to your particular model of clippers.
Interphase, Description of what happens
The trachea is ringed with _____ to prevent its collapse during inspiration.
There are several ways to carry a gun. the trail carry: is a good choice when all other hunters are in front of you leaves a hand free for balance is recommended when walking in snow is recommended when walking through brush
Answering the question, the trail carry leaves a hand free for balance
Trail carry: your hands will be free and balance but this position is not advisable if you’re walking in the brush or snow
There are many ways to safely handle a gun but regardless of how you carry it while hunting, there are several measures you must put in place.
Further ExplanationSome of which include:
Ensure the safety is onYour finder should not be close to the trigger guard, that is, your finger should place along the frame of the fun to avoid accidental discharge.Ensure you keep the muzzle point in a safe direction to ensure that you do not point your gun to what you do not have in mind to shoot or you do not intend to shoot.Do not load your gun until when it’s time to go hunting, that is, the gun shouldn’t be loaded until you are ready to use it.Some of the best positions to carry arms include
Side carry or elbow: this position is very comfortable but appears slightly difficult to control the muzzleSling carry: this position is easy, particularly when you trek from one place to another. It is also very important to place your place on the sling to avoid sliding off your shoulderTwo-Handed: This position gives the best control, particularly when you need to shoot very quicklyCradle carry: this position is secure and very comfortableShoulder carry: this position is perfect particularly in the waist-high brush.LEARN MORE:
There are several ways to carry a gun. the trail carry: https://brainly.com/question/4578196A hunter is right-handed. when shooting a shotgun, this hunter should: https://brainly.com/question/3657904KEYWORDS:
firearmsfree for balancetrail carrycradle carryhuntingBradley decides one day to run a marathon without any training. After ten minutes has elapsed and Bradley has run half a mile, he begins to get cramps in his thighs. He is also breathing very rapidly. What is causing the cramps on Bradley's legs?
Answer:
The correct answer is "lactic fermentation".
Explanation:
Lactic fermentation is a type of anaerobic respiration that occurs in muscle cells as a way to produce energy when not enough oxygen reach the cells. This happens when a person is performing anaerobic exercise for a considerable period of time or without proper training, like Bradley that tried to run a marathon without any training. Lactic fermentation produces lactic acid build up on muscles, which is what is causing the cramps on Bradley's legs.
Which stress management technique involves exercising all the body's muscle groups?
In what portion of the cell cycle does the cell double in size
Fermentation reactions generally occur under conditions of:
Fermentation reactions occur in anaerobic or low-oxygen environments.
Fermentation generates energy without oxygen, unlike aerobic respiration. Certain microbes and cells can ferment to produce energy under anaerobic settings. Bacteria, yeast, and human cells are included.
When oxygen is scarce, fermentation produces energy. It breaks down organic molecules like glucose without oxidation like aerobic respiration. The process generates ATP (adenosine triphosphate) and numerous end products depending on the organism and fermentation pathway.
Yeast ferments sugar into alcohol and carbon dioxide, and bacteria and muscle cells ferment sugar into lactic acid. These reactions make bread, wine, beer, and yoghurt.
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The complete and persistent absence of __________ is used to determine brain death.
Patients who have experienced a severe, irreversible brain injury with a known etiology should be evaluated for brain death.
What are the main sign and symptoms of brain death?Coma, the absence of brain stem reflexes, and apnea are the three key signs of brain death.
An assessment for brain death should be considered when a patient has suffered a serious, irreversible brain injury with a recognized etiology.
A patient who has been correctly deemed brain-dead is both legally and medically dead.
The apnea test is typically the last step in determining brain death. It is carried out after determining that a coma is irreversible, unresponsive, and that brain stem reflexes are absent.
Therefore, The completes and persistent absence of Brain stem reflexes, and apnea is used to determine brain death.
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The passage of large molecules through the cell membrane into the cell is called
The hospice nurse is visiting the wife of a client who died 10 months ago. the wife states, "my life is meaningless since my husband died." the nurse recognizes that the client is in which stage of grief?
If morphine is treated with the chemical acetic anhydride, it can be converted into another powerful analgesic called ________
The cactus has a specialized fleshy stem and it's leaves function only for protection. Which plant tissues most likely makes up the stem?
The correct answer is vascular tissues.
Vascular tissues most likely form the stem. The prime vessels observed on the vascular tissue are the phloem and the xylem. These two tissues function as an element for the conduction of nutrients and water within the stem.
The xylem transports some nutrients and water from the roots, while the phloem transports the soluble organic constituents, which were generated at the time of photosynthesis from the leaves.
Manufacturing recombinant dna molecules involves cutting a gene from its normal location, inserting it into a circular piece of dna from a bacterial cell, and then transferring the circle of dna to cells of another species. which of the below describe the circular piece of dna?
If only 10% of energy is passed on when an organism is eaten, what happens to the other 90%
(select all that apply.) the four organic molecules common to organisms are _____.
Indicate which strategy is likely to lead to optimal muscle glycogen replenishment. type of carbohydrate
Which of the following statements is true?
The sides of a glacier move more quickly than the middle.
Most glaciers are found in mountainous areas near the equator.
Glaciers and ice caps have the same salinity as ocean water.
Glaciers create wide, U-shaped valleys and sharp-peaked mountains.
Answer: Glaciers and ice caps have the same salinity as ocean water
Explanation:its like frezan the ocean
Name two factors that cause a decrease in population size.
Mortality and emigration are the two factors that cause a decrease in population size.
Mortality is defined as the number of deaths in a population over time. When rates of mortality are high, population size might be reduced. Disease, accidents, and natural disasters are all common causes of death.
Emigration is a migration of people away from a country or region. When people emigrate, they are no longer considered a part of the population of the country or territory from where they departed. People may emigrate for a variety of reasons, including political instability, economic opportunities, and war.
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Final answer:
A decrease in population size can result from economic and social crises that lead to lower birth rates, as well as high death rates due to health issues. Environmental factors, such as the availability of resources influenced by human activities, like the use of pesticides and habitat destruction, also affect population size.
Explanation:
Two factors that cause a decrease in population size include economic and social crisis, leading to reduced birth rates, and high death rates due to health issues and the collapse of social safety nets. For example, populations decline when birth rates drop during periods of economic hardship as individuals delay or forego having children. Additionally, a rise in mortality, due to factors like alcoholism or heart disease, can lead to a population decrease if the death rate surpasses the birth rate.
Another factor that can decrease population size is environmental resources, which are affected by human activities such as the use of pesticides and habitat destruction. A decline in available resources can lead to increased mortality rates and lower birth rates over time.
Which group of plants contains the tallest and oldest trees on earth?
A television sells for $600. Instead of paying the total amount at the time of the purchase, the same television can be bought by paying $150 down and $50 a month for 14 months. How much is saved by paying the total amount at the time of the purchase?
An increase in the number of brown bears in an Alaskan river ecosystem causes the ecosystem's carrying capacity for salmon to decrease. Which two terms describe the brown bear in this scenario? A.Parasite B.Biotic factor C.Limiting factor D.Primary consumer
Answer:
B and C, biotic factor and limiting factor
Explanation:
The carrying capacity of an ecosystem is the maximum number of organisms that an ecosystem can support based on the resources it contains.
The more the resources an ecosystem has, the more the number of organisms it can sustain and the higher the carrying capacity. On the other hand, the lower the resources an ecosystem has, the lower the number of organisms it can sustain and the lower the carrying capacity. These resources are often refers to as limiting factors.
Properly defined, limiting factors are those variables that act on a population and prevent it from increasing indefinitely. These variables can be density dependent or density independent.
Biotic factors are the living factors of the environment or an ecosystem that tend to interact with individuals living in such environment/ecosystem.
Hence, in this case, the brown bears can be viewed as a limiting factor since their increase in the river ecosystem decreased the ecosystem's carrying capacity for salmon. At the same time, they are part of the living components of the salmon's environment and can therefore be considered as a biotic factor.
The fossil record documents trends in which brains that are large relative to body size evolved in certain lineages, including hominins. in such lineages, what can you infer about the costs and benefits of large brains?
Final answer:
The evolution of large brains in hominins is attributed to their significant advantages in intelligence, social behavior, and adaptability, despite their metabolic costs. Enhanced cognitive abilities and improved diet through advanced tool use and meat consumption facilitated the sustaining of larger brain sizes.
Explanation:
When evaluating the evolution of large brains in hominins, it's essential to consider the costs and benefits. The fossil record indicates that large brains evolved in certain lineages, such as Homo, and are not merely a consequence of increased body size, but more likely related to complex behavioral adaptations. Large brains, while metabolically costly and demanding in early human development, provided significant evolutionary advantages such as enhanced cognitive abilities, improved social interactions, and advanced tool-making skills. The disproportionate energy use of the brain, requiring about 25-30% of human metabolic energy, points to the necessity of a high-quality diet, ultimately leading to a reduced gut size in hominins. The shift in diet, with an increased emphasis on meat, allowed for the nutrition necessary to sustain larger brains. Moreover, larger brains facilitated the development of material culture, complex social structures, and environmental adaptations. The evidence suggests that the benefits of a large brain, such as increased intelligence and social complexity, outweighed the energetic costs in evolutionary terms.
When an athlete is nearing the end of a race ad her cells are low on oxygen?
about one in ____ individuals diagnosed with an eating disorder is male.
Further explanation
During this time, eating disorders are always associated with women. Some of the well-known eating disorders are bulimia and anorexia nervosa. In fact, eating disorders can also be experienced by men, both children and adult men.
Eating disorders in men were first recorded in the 16th century, precisely in 1689. At that time, the doctor from England, Richard Morton, noted two cases of anorexia nervosa in one male patient. Then in 1874, Ernest Charles Lasegue and Sir William Gull made another case report about men with anorexia nervosa.
after these early cases, men with eating disorders were considered "rare" until 1972 when Peter Beaumont and colleagues conducted research on anorexia nervosa in men. But now, a lot of research on the treatment of eating disorders that do not involve male subjects.
the total proportion of men with eating disorders is not known with certainty. Older statistics say 10 percent, but given the reluctance of men with eating disorders to admit that they have the problem, most experts believe the figure is higher.
The National Association for Males with Eating Disorders estimates that 25 to 40 percent of people with eating disorders are men.
Among other eating disorders, men have relatively more representation in the categories of binge-eating disorder and Avoidant Restrictive Food Intake Disorder (ARFID). Statistics show that about 40 percent of people with binge-eating disorders are men.
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Class: high school
Subject: biology
Keywords : men, eating disorders, statistics
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Humans have what type of circulatory system?
A. Single Loop
B. Triple Loop
C. Double Loop
D. Quadruple Loop
Different species that occupy similar niches in isolated areas develop morphological similarities. this phenomenon is called _____.