Q: All living things require what, which most ecosystems obtain from the sun? Choices: - oxygen - water - heat - energy A:
energy

Q: In 1802, charles and gay-lussac both proposed that for a fixed amount of gas at a constant pressure, what is directly proportional to its absolute temperature? Choices: - air - liquid - density - volume A:
volume

Q: Q: Channel proteins and carrier proteins help substances diffuse across what? Choices: - endoplasmic reticulum - ribosomes - cytoplasm - cell membrane A:
A: cell membrane

Question: Q: The barrier defenses are not a response to infections, but they are continuously working to protect against a broad range of what? Choices: - mates - nutrients - ecosystems - pathogens A:
Answer: pathogens

*Question*
Q: How do most plants create food? Choices: - electrolysis - atherosclerosis - glycolysis - photosynthesis A:
**Answer**
photosynthesis

(Q).
Q: The number of waves that pass a fixed point in a given amount of time is called what? Choices: - wavelength of a wave - spectroscopy of a wave - spread of a wave - frequency of a wave A:
(A).
frequency of a wave