I think that The answer is b.
Answer:
Without trees, humans would not be able survive because the air would be unsuitable for breathing. If anything, people would have to develop gas masks that filter the little oxygen that would be left in the air. ... Anyway, trees take carbon from the atmosphere through photosynthesis in order to make energy
Explanation:
it says choose all that apply. meaning there is more than one answer. you only chose one. the answer you chose is correct but "the substance" and "the amount" go along with "difference in temperature".
Answer:
He is eating breakfast now
When "now" is there, then that means it's still going on so we use "ing" verb
