Question

because the earth has only a fixed amount of carbon , it is important that it gets recycled through the

Answer 1

Trees because they need carbon dioxide for the process of photosynthesis and they produce oxygen in exchange and at the night cycle reverses and hence carbon dioxide level is maintained

Answer 2

Since the earth has just a settled measure of carbon, it is imperative that it gets reused through the trees since they require carbon dioxide for the procedure of photosynthesis and they deliver oxygen in return and at the night cycle turns around and consequently carbon dioxide level is kept up.