The earliest humanlike creatures that lived in africa three to four million years ago were
Hot coffee in a vacuum flask (thermos) is an example of what type of system?
Final answer:
Hot coffee in a vacuum flask (thermos) is considered an approximation of an isolated system in chemistry, which is designed to significantly slow down heat transfer but not completely prevent it.
Explanation:
Hot coffee in a vacuum flask, also known as a thermos, is an example of an isolated system in chemistry.
An isolated system is defined as one that does not allow the transfer of energy or matter into or out of the system.
While no system can be perfectly isolated due to eventual heat transfer to the surroundings, a thermos with hot coffee is a good approximation because it is designed to significantly slow down heat transfer, thanks to its vacuum insulation and other features like reflective walls.
Over time, however, even in a thermos, the coffee will cool as some heat is lost to the surroundings, illustrating that a truly isolated system does not exist but can be approximated for practical purposes.
please help, i dont understand this?
What is the type of organism that breaks down the cells of a dead organism?
Marcus is admitted to the hospital for a bone marrow stem cell transplant from his brother. What will happen after his brother’s stem cells are transplanted into Marcus?
The answer is B The stem cells are divided through mitosis to create diploid stem cells.
I hope this helps
Answer:
Explanation: I took the test
One of the longest field studies of predator-prey population cycles has been of
Ll organisms are made of one or more cells, which are the fundamental units of life.
a. True
b. False
What happens to a gummy bear in salt water?
Is a crocodile a carnivore herbivore or omnivore?
Crocodiles are carnivorous animals that feed on many vertebrates such as fish, reptiles, birds and mammals, and occasionally invertebrates such as molluscs and crustaceans, depending on the species and age.
What are Carnivorous?A carnivore is defined as an organism that eats mostly meat, or the flesh of animals. Sometimes carnivores are called predators while the organisms that prey on carnivores are called prey. Carnivores are a major part of the food web which is the details of which organisms eat which other organisms in the wild.
These are described as animals that eat other animals. The word is derived from the Latin word and means "flesh-eater." Wild cats, such as lions, crocodiles and tigers, are examples of vertebrate carnivores, as are snakes and sharks, while invertebrate carnivores include sea stars, spiders, and ladybugs.
Thus, Crocodiles are carnivorous animals that feed on many vertebrates such as fish, reptiles, birds and mammals, and occasionally invertebrates such as molluscs and crustaceans, depending on the species and age.
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He flap of elastic cartilage that protects food from entering the larynx when swallowing is the
Heartworms are an example of what types of parasite?
A patient reports abdominal cramps and diarrhea. the patient's serum potassium level is 6.8 meq/l. what might the nurse infer from this finding?
Order the taxa from largest (first) to smallest (fifth). 1. first domain 2. second order 3. third kingdom 4. fourth class 5. fifth phyla/division
What factor does the nurse expect to influence the development of teeth in neonates?
The factors that the nurse expects in the influence of development of teeth in the neonates are the following;
- Medication and illness of neonate
- Fluoride level that is present in the supply water
- The medication or illness that the mother has
The ability of a postsynaptic cell to respond to a neurotransmitter depends on:
Both osmosis and diffusion require energy and are considered active transport
True or False?!
Explanation:
Diffusion can be defined as the movement of the particles from a higher amount to the lower amount. it is usually used for gaseous particles.
Osmosis can be defined as the movement of the solvent particles from an area where its amount is high or more to an area where its amount is low or less through the semi permeable membrane.
These two processes does not requires energy and is not an active process.
Rice is a procedure for treating minor strains and sprains. what does it stand for?
"The acronym RICE stands for Rest, Ice, Compression, and Elevation. It is a common treatment for minor strains and sprains.
To elaborate on the RICE method:
- Rest: The first step is to rest the injured area to prevent further damage and to allow the body to begin the healing process.
- Ice: Applying ice to the injured area helps reduce swelling and pain. Ice should be applied for 20 minutes every 2 to 3 hours during the first 48 hours after the injury.
- Compression: Wrapping the injured area with an elastic bandage can help minimize swelling and provide support. However, the bandage should not be too tight as to cut off circulation.
- Elevation: Elevating the injured area above the level of the heart also helps reduce swelling by decreasing blood flow to the area.
The RICE method is most effective when it is started soon after the injury occurs and continued for at least 48 hours. It is important to note that while RICE can be very effective for minor injuries, more serious strains and sprains may require medical attention."
During the cold winter months, the surface of a lake becomes hard ice. This is due to which change of state?
Condensation
Evaporation
Melting
Freezing
Answer:
Freezing
Explanation:
During cold winter months, the water on the surface of lakes/water bodies changes its state from liquid to solid state (ice) and the process is known as freezing. This phenomenon helps the flora and fauna living under such water bodies survive even in extremely cold weather. The ice being less dense than water floats on the surface of lake and acts as a shield. This shield of ice acts as an insulator and restricts the outside cold waves from entering the water beneath the ice cover and maintains optimum temperature inside. Hence due to the change of state of water, the flora and fauna is able to survive even in harsh winter season.
What is another name for carbohydrates? a atp b fats c glucose (sugar)?
Genes are positioned on thread like bodies found in the nucleus of a cell. they are called
BIOLOGY HELP PLEASE
Water is the most abundant molecule found in living organisms. Most mammals, in fact, are approximately 70% water by weight. About two-thirds of this water is present inside cells. The other one-third is present outside cells (e.g., in blood plasma or other body fluids). Why is water so important to cells?
Question 18 options:
Water is stored in cells to be used when the organism gets thirsty.
Almost all chemical reactions in life process occur in solutions with water.
The main structural component found in plasma membranes and cell walls is water.
Samuel always receives a painful shock when he turns on the lamp in his study. after a while, samuel refuses to touch the switch on the lamp. the lamp switch was a(n) ________ stimulus that elicited a(n) ________ response after a period of time.
Describe the stages of photosynthesis. Use the terms thylakoid, light-dependent reactions and light-independent reactions.
Photosynthesis in plants occurs in two stages. These stages are known as the light-dependent reactions and the Calvin Cycle.
The first stage of photosynthesis is the light dependent reactions. These reactions take place on the thylakoid membrane inside the chloroplast. During this stage light energy is converted to ATP (chemical energy) and NADPH (reducing power).
The second stage of photosynthesis is the Calvin Cycle. These reactions occur in the stroma of the chloroplast. Energy from ATP and electrons from NADPH are used to convert carbon dioxide into glucose and other products.
Photosynthesis comprises of two stages: the light-dependent reactions, which occur in the thylakoid membrane and convert light energy into chemical energy, ATP and NADPH, and the light-independent reactions, or Calvin Cycle, which happen in the stroma and utilise the ATP and NADPH to convert carbon dioxide into sugars.
Explanation:Photosynthesis consists of two stages: the light-dependent reactions and the light-independent reactions, or Calvin cycle. Initially, the light-dependent reactions occur in the thylakoid membrane where light energy is captured by pigments (like chlorophyll) and converted into chemical energy, ATP and NADPH. These reactions also involve the splitting of water molecules and the releasing of oxygen. The energy-carrying molecules ATP and NADPH are then passed on to the second stage of the process.
The light-independent reactions, otherwise known as the Calvin cycle, take place in the chloroplast stroma. Here, ATP and NADPH are used to transform carbon dioxide into sugar (carbohydrates) through a series of complex enzymatic reactions. Although they were named light-independent reactions because they do not use light energy directly, they rely on the ATP and NADPH produced by the light-dependent reactions.
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Certain species of insects introduced accidentally in a forest are destroying all the Douglas fir trees in that forest. The wood of these trees is extensively used for construction. In order to control the damage caused by these insects, the forestry department decided to introduce the moth caterpillar in the forest. These caterpillars are natural predators of the insects. Which method did the forestry department implement to control the invasive species?
The forestry department implemented a(n) _______ control method.
Answer: Biological control method
A biological control method is used to control the growth of unwanted and undesired species of plant and animals in a natural habitat. This includes the induced growth of plants, animals and insects which help to irradicate the growth of undesired plants, animals and insects. Therefore, introduction of invasive species of caterpillar moth will limit the population of insects causing harm to forest woods.
Answer:
biological
control method.
Explanation:
The molecule arrangement of ice, water and steam are very different. _______ has the most ordered arrangement, ______ has the next most orderly arrangement, and ___________ has the least orderly arrangement of molecules.
Answer:
A) ice, water, steam
Explanation:
I did the usatestprep
Daphnia are freshwater organisms sometimes referred to as “water fleas.” Design an experiment that
could be used to test the effects of temperature on the size of a daphnia population. In your
experimental design, be sure to:
• state a hypothesis to be tested
• describe how the control group will be treated differently from the experimental group
• identify the independent variable in the experiment
• identify the type of data that will be collected
Answer:
Experiment to test the effect of temperature on the size of a daphnia population:
1. The hypothesis to be tested is: "Cooler temperature will reduce the size of the population due to a decrease in the reproduction rate while the hotter temperature will increase the size of the population due to an increase in the reproduction rate.
2. In all groups, daphnia will be counted weekly at the same time. The amount of water and nutrients supplies will be the same between groups. The only thing that will change is the temperature. For example:
Control group will be at 20 Celcius degrees, the cooler group will be at ten Celcius degrees, and the hotter group will be at 30 Celcius degrees.
3. The independent variable is the temperature.
4. The dependent variable (data that will be collected) is the size of the population.
Explanation:
Daphnias are microscopic crustaceans, which are called water fleas because of their saltatory behavior like fleas. Their life span and reproduction can be affected by different factors, including the abundance of predators, food, and temperature. They alternate their reproduction strategy during their life; they can reproduce asexually and sexually. Lower temperatures (cooler) decrease their metabolic and reproduction rate while higher temperature (hotter) increase their metabolic and reproduction rate. Because they can reproduce more times during their life span and the reproduction rate is higher in higher temperatures, I expect that temperature will affect the size of the population of Daphnia.
What are the similarities and differences of leisure, recreation and play?
what does a cytoskeleton do?
Wind moving in two directions over a prairie makes air in the middle spin. This is the beginning of a
Diffusion by which mechanism occurs more rapidly in metal alloys?