Because the soil didn't have the same nutrients it has now due to lack of decomposition of other plants and animals.
Answer:
During aerobic respiration, oxygen is reduced, donating an electron to hydrogen to form water. The entire process of cellular respiration oxidizes glucose. This produces the majority of the energy released in cellular respiration
Explanation:
im taking the same thing :)
The answer is: [D]: "ammonia" .
________________________________________________
Sugar ...... (I need to make this 20 characters to submit)