Most stars are main sequence stars as they spend about 90% of their lifetimes in this phase, which is confirmed by H-R diagram observations.
A is correct
Explanation:The correct statement regarding the main sequence stars is: A) most stars are main sequence stars. Astronomical data confirms that about 90% of the stars observed in the sky are on the main sequence of an H-R diagram, which makes sense considering that stars spend the majority of their life in this phase, undergoing hydrogen fusion.
This is evidenced by the fact that stars are found in various spectral types ranging from O (most massive and most luminous) to M or L (least massive and least luminous) all aligned along the main sequence, representing different stellar masses.
which of the following are attributed to linnaeus?
Carl Linnaeus is celebrated for three main contributions: developing the taxonomic system for classifying organisms into related groups, establishing the binomial nomenclature for naming organisms, and systematically grouping together organisms sharing common traits.
Explanation:Carl Linnaeus, a Swedish botanist, zoologist, and physician, is significantly credited with several achievements in biology. Among his works, three attributes stand out:
He developed a taxonomic system for categorizing organisms into related groups. This hierarchical model featured classifications such as kingdom, class, order, family, genus, and species, and has since been expanded to include additional levels like domain, phylum, subclass, superorder, tribe etc.Linnaeus introduced the binomial nomenclature, a system of naming organisms using two unique Latin names – the genus name and the species name. This vastly reduced confusion caused by regional differences in common names of organisms.He grouped organisms that shared common traits creating categories like 'mammals' for animals with mammary glands, demonstrating his systematic approach to classification.These contributions of Linnaeus have laid the groundwork for modern taxonomy and biological nomenclature.
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Which of the following cavities would a surgeon performing an operation on the intestines have to open?
A) Abdominopelvic and abdominal
B) Thoracic and abdominal
C) Abdominopelvic and thoracic
D) Thoracic and pericardial
Final answer:
A surgeon operating on the intestines would have to open the A) Abdominopelvic and abdominal cavities. The pleural cavity, which is associated with the lungs, is part of the thoracic cavity.
Explanation:
The question asks about the body cavity a surgeon would open to operate on the intestines. The correct answer is A) Abdominopelvic and abdominal. The abdominopelvic cavity is the largest in the body and includes both the abdominal cavity (housing the digestive organs, such as the intestines) and the pelvic cavity (housing the reproductive organs).
As for the pleural cavity, it is part of the thoracic cavity which also contains the pericardial cavity surrounding the heart. These cavities are all located within the larger anterior (ventral) cavity. Thus, a surgeon must open the abdominopelvic cavity to perform operations on the intestines.
Leaf vein patterns in monocot flowering plants are parallel.
TRUE
or
FALSE
Answer:
The given statement is true.
Explanation:
Monocot plants leaves have different kind of venation to dicot plants. All plant Leaf veins are arranged in a reticulate arrangement or in a parallel through the length of the leaf throughout the leaf.
In most of the monocot flowering species, monocot leaves have parallel venation arrangement while dicots have reticulate venation.
Parallel venation is an evolved adaptive feature of monocots over dicots as it provides the benefit of transportation to the end of the leaves.
Thus, the statement is true.
Why is the tunica intima, the innermost layer of arteries and veins, made of epithelial cells?
Select all that apply. Invertebrates have only nonspecific immunity, which means _____.
the body attacks anything foreign to the body
the body attacks particular foreign invaders
immunity is inborn or innate
immunity is adaptive
Fossil A was found at a depth of 400 feet and fossil B was found at a depth of 315 feet. Which one is older?
Fossil B
Fossil A
They are the same age
Not enough information to determine
As fast as you can, name the planets in order from least mass to most mass. HINT: Check your notes about the gravitational force on each planet compared with earth.
Mercury, Mars, Uranus, Venus, Earth, Neptune, Saturn, Jupiter
Which process uses acetyl CoA as a reactant
Answer:
The Krebs cycle
Explanation:
Apex
Human activity on land can have a profound influence on marine ecosystems. True/False
Answer: The given statement is True.
Human activities on land can have a profound influence on marine ecosystems. These include both direct as well as indirect activities by humans, which influence marine ecosystems.
For instance, direct human activities like use of fertilizers in agriculture can have a profound influence on the marine ecosystem. Chemical fertilizers provide extra nutrients to the plants, increasing the fertility of the soil and thereby promote the growth of plants.
These fertilizers are harmful to the aquatic lives. They travel to the marine ecosystem via water run off from the agricultural land. Excess fertilizers cause the formation of algal blooms, which are very toxic. They lead to the lack of oxygen in the water, which results in the loss of aquatic lives.
Which of the following is NOT an example of physical weathering?
Wind blowing and eroding sandstone
Acid rain dissolving limestone
Ocean waves crashing against basalt
A river carving out a canyon through bedrock
How many more phases occur during meiosis than during mitosis
Answer:
The correct answer would be 4 phases.
Mitosis is a equational division which results in the formation of two daughter cells with equal number of chromosomes as there were in parent cell. It contains four phases prophase, metaphase, anaphase, and telophase. It helps in growth and repair of the cells.
In contrast, meiosis is reductional division which leads to production of four haploid daughter cells from a single diploid parent cell. It usually takes place during the formation of gametes. It takes place in two divisions namely meiosis I and meiosis II.
Meiosis I contains four phases:
prophase Imetaphase Ianaphase Itelophase IMeiosis II also contains four phases:
prophase IImetaphase IIanaphase IItelophase IIA tubal ligation is a permanent sterilization procedure in which a woman's fallopian tubes are blocked or severed. Which of the following explains how this process can be used to prevent pregnancies? It prevents sperm from reaching the egg and fertilizing it. It prevents the maturation of the follicle and the release of an egg. It prevents a zygote from being implanted into the uterine wall. It prevents the thickening of the walls of the uterus.
The permanent sterilization prevents sperm from reaching the egg and fertilizing it.
What is sterilization?Sterilization is the process of permanent birth control.
The women sterilization process s called tubal ligation.
Tubal ligation closes all the Fallopian tubes, so that sperm could not reach the uterus of the women.
The men sterilization is called vasectomy.
Thus, the correct option is A.
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How many cotyledons does a dicot have?
i believe the answer is two
HELP PLEASE!
An osteocyte is a cell that...
A. maintains the bone matrix
B. reabsorbs or breaks down the bone matrix
C. forms the bone matrix
D. specializes into other bone cells
What happens to macromolecules from food during digestion?
if a hypothesis is shown to answer several different natural phenomena or supported by other evidence it can be considered to be a
All of the following wavelengths can be seen by the human eye EXCEPT red light waves infrared waves blue light waves violet light waves
The human eye can see visible light in the range of 380 nm to 740 nm, which includes colors red through violet. The wavelengths outside this range, such as infrared waves, cannot be seen.
The human eye can see light with wavelengths that range from about 380 nm to 740 nm. This range includes the colors of the rainbow, which can be remembered by the mnemonic ROY G BIV - for Red, Orange, Yellow, Green, Blue, Indigo, and Violet. However, the wavelengths that fall outside of this visible spectrum, such as infrared waves, cannot be seen by the human eye. Infrared light has longer wavelengths than the visible red light, and humans perceive this as heat rather than light.
Visible light is composed of a spectrum of colors that include red light waves, blue light waves, and violet light waves. However, all wavelengths can't be seen by the human eye; specifically, infrared waves are outside the visible range. Thus, all of the listed wavelengths can be seen by the human eye except infrared waves.
Can anyone please help?
The scientific method can best be described as a plan of a set of
How do mitochondria work
How are conditions of early Earth similar to the deep sea vents today?
What is the temperature in mars ?
Which organelle is responsible for manufacturing proteins?
Vacuoles
Lysosomes
Golgi apparatus
Ribosomes
All of the following are nonspecific defense responses made by the human body except
A. the skin as a physical barrier to pathogens.
B. mucus produced in the nasal and oral passages to trap pathogens.
C. wax produced in the ear to trap pathogens.
D. T-cells target specific pathogens.
Answer:
The correct is the answer is option D.
Explanation:
Non-specific defense response is the immune system that provides defense against more than one type of antigen or pathogen. The non-specific defense provides responses include physical barriers, protein defenses, cellular defenses, inflammation, and fever. Mucus in respiratory tracts and nose traps microbes and pathogens from invading the body.
Wax also captured foreign bodies and other pathogens from entering our ears. Non-specific defenses are surface coverage defenses.
T-cells are the specific white cells that target specific antigens or pathogens that are a specific defense provided by the specific immune system.
Thus, the correct answer is option D.
which carbohydrate are used as structural support instead of energy storage
Carbohydrates are used as fuels and building material, organic molecules made of sugars and their polymers that is large molecules consisting of many identical or similar subunits connected together through polymerization. Carbohydrates has three categories that is according to the number of simple sugars: (1) Mono saccharides (2) Oligo saccharides and (3) Polysaccharides. Polysaccharides is formed by enzyme-meditated condensation reactions and is stored in the muscle and liver of vertebrates. These are macromolecules that are polymers of a few hundred or thousand monosaccharides. Starch and glycogen are examples of polysaccharide that is use as energy storage while cellulose and chitin are polysaccharides that is use as structural support. Cellulose is a liner unbranched polymer of glucose most abundant organic molecule on the planet, reinforces plant cell walls and cannot be digested by most animals because they lack the enzyme that can hydrolyze the linkage in BLANK. While Chitin is a structural polysaccharide that is a polymer of an amino sugar, forms the exoskeleton of arthropods (insects, crawfish) and found in the cell walls of some fungi.
James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box. He also drops a handful of marbles into the box. Which statement most likely describes the structures he has represented so far? He is making an animal cell. The box is the cell membrane, and the balloon represents the large vacuole. The marbles are the endoplasmic reticulum. He is making a plant cell. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the tiny ribosomes. He is making a plant cell. The box is the cell wall, and the balloon represents the nucleus. The marbles are the centrioles. He could be making either a plant or animal cell. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the centrioles.
Answer:
B). He is making a plant cell. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the tiny ribosomes.
Explanation:
I just took the test on Edge 2020
Which of the following is NOT a form of asexual reproduction?
Spore formation
Budding
Fertilization
Fission
Which of the following best explains what happens during metaphase? A. The sister chromatids are pulled apart. B. The chromosomes line up. C. The chromosomes coil up and condense. D. The cell is developing and going about its daily activities. Which of the following best explains what happens during metaphase? A. The sister chromatids are pulled apart. B. The chromosomes line up. C. The chromosomes coil up and condense. D. The cell is developing and going about its daily activities.
Answer:
The correct answer is option b. the chromosomes line up.
Explanation:
Metaphase is the phase which takes place between prophase and anaphase. It is mitotic phase in which microtubules attached. The chromosomes line up during this phase.
Metaphase is characterized by the attachment of spindle to the chromosomes. Attachment is complete by the microtubules of spindle.
Thus, the correct answer is option b.the chromosome line up.
Make up a list of questions to ask five people to find out if they are more right- or left-brain oriented. You should include questions about what they like to do, their skills, and weaknesses. For example, someone very good at math and learning foreign languages is probably more controlled by the left side of their brain. When you finish interviewing all five people, write a report on what you have discovered. Include the following in your report:
Skills most likely controlled by the left side of the brain.
Skills most likely controlled by the right side of the brain.
List of the people you interviewed and why you think they are more strongly controlled by one side of the brain as opposed to the other side.
Over thousands of years a comet makes several circuits around the solar system. Describe how a comet might change after many trips near the sun