2. Which organisms make carbon dioxide in the atmosphere available for all living organisms in
the ecosystem?

Photosynthesis by land plants, bacteria, and algae converts carbon dioxide or bicarbonate into organic molecules. Organic molecules made by photosynthesis are passed through food chains, and cellular respiration converts the organic carbon back into carbon dioxide gas.

Explanation:

land plants, bacteria, and algae

Explanation:

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

yes, because even though a theory has a  lot of evidence to support it, it is not always true