Answer:
D
Explanation:
Comets are brightest near the sun.
C)Human activity
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Answer:
If there were no plants, the carbon dioxide level in the world would have risen in a much steeper way and the oxygen level would deplete in a much steeper way too.
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Answer:
Active transport uses ATP and moves substances against the concentration gradient; facilitated diffusion does not.
Explanation:
Active transports moves against the concentration gradient (hence why it needs energy or ATP to do so, its going "against the grain"). Facilitated diffusion does not require ATP but does something require carrier proteins during passive transport.