Answer the following question given this paragraph: Nitrogen is another common element found in living things. It is needed to form both proteins and nucleic acids such as DNA. Nitrogen gas makes up 78 percent of Earth's atmosphere. In the nitrogen cycle, nitrogen flows back and forth between the atmosphere and living things. You can see how it happens in Figure below . Several different types of bacteria play major roles in the cycle. Q: What gas comprises about three-fourths of earth's atmosphere? Choices: - hydrogen - carbon dioxide - oxygen - nitrogen A:
nitrogen
Answer the following question given this paragraph: Figure 36.14 In the human ear, sound waves cause the stapes to press against the oval window. Vibrations travel up the fluid-filled interior of the cochlea. The basilar membrane that lines the cochlea gets continuously thinner toward the apex of the cochlea. Different thicknesses of membrane vibrate in response to different frequencies of sound. Sound waves then exit through the round window. In the cross section of the cochlea (top right figure), note that in addition to the upper canal and lower canal, the cochlea also has a middle canal. The organ of Corti (bottom image) is the site of sound transduction. Movement of stereocilia on hair cells results in an action potential that travels along the auditory nerve. Q: In the human ear, sound waves cause the stapes to press against what? Choices: - yellow window - shaped window - Idea Window - oval window A:
oval window
Q: Answer the following question given this paragraph: 25.4 Seedless Vascular Plants Vascular systems consist of xylem tissue, which transports water and minerals, and phloem tissue, which transports sugars and proteins. With the development of the vascular system, there appeared leaves to act as large photosynthetic organs, and roots to access water from the ground. Small uncomplicated leaves are microphylls. Large leaves with vein patterns are megaphylls. Modified leaves that bear sporangia are sporophylls. Some sporophylls are arranged in cone structures called strobili. Q: What type of tissue transports water and minerals in a vascular plant? Choices: - collagen - capillaries - chlorophyll - xylem A:
A: xylem
Question: Answer the following question given this paragraph: Along with the skin, the integumentary system includes the nails and hair. Both the nails and hair contain the tough protein, keratin. The keratin forms fibers, which makes your nails and hair tough and strong. Keratin is similar in toughness to chitin, the carbohydrate found in the exoskeleton of arthropods. Q: What is the name of the protein that is found in hairs and nails? Choices: - cellulose - chromatin - Skin - keratin A:
Answer: keratin
*Question*
Answer the following question given this paragraph: The radius of an atom is approximately 10 times larger than the radius of its nucleus. If the radius of the nucleus were 1.0 cm, what would be the radius of the atom in centimeters? in miles?. Q: Approximately how much larger is the radius of an atom than that of its nucleus? Choices: - 1 times - 1000 times - 100 times - 10 times A:
**Answer**
10 times
Q: Answer the following question given this paragraph: Fertilization is the union of a sperm and egg, resulting in the formation of a zygote. Q: Fertilization is the union of a sperm and egg, resulting in the formation of what? Choices: - a cytoplasm - a nuclei - a bacteriophage - a zygote A:
A: a zygote