The producers at the beginning of the Earth's food chain are plants.
Answer - Theory
Reasoning - Your best bet and term to describe the evolution by natural selection is theory as to still scientific theory/research is still ongoing and changes can be made in a different direction.
Answer B And C
The decoding of information in a cell's DNA into proteins begins with a complex ... use different sets of catalysts to express only specific portions of these instructions to ... that the process of DNA replication be as accurate as possible (Figure 1). ... number depends on how active a particular cell is in synthesizing proteins.
Explanation:
Answer: Here's The Cell Cycle Concept Map