Why is most of the carbon dioxide produced by green plants not excreted as metabolic waste (given off because it is not needed)?

What are the characteristics of living things

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

What enzyme is most important for dna replication and why?