Answer:
No, they do not have backbones
Explanation:
A is the answer to this problem
They converted carbon dioxide to oxygen. The increased oxygen levels allowed for cellular respiration to occur instead of only glycolysis. The atmosphere became thinner, decreasing temperatures of the planet as well.
Answer:
Because plants decrease the amount of CO2 in the air. By decreasing the plant population you decrease the amount of CO2 that can be removed.
The following question is how would you divide 16÷4
