Mutations are changes in the DNA of an organism. Examples of beneficial mutations include HIV resistance
Catabolic reactions use energy to synthesize large molecules from small molecules.
<h3>What is a catabolic reaction?</h3>
The Catabolic reaction is the action of the set of metabolic pathways that breaks down molecules into smaller units that are either oxidized to release energy or used in other anabolic reactions. Catabolic reactions are a type of metabolic reaction that takes place within a cell. An example of a catabolic reaction is the process of food digestion, where different enzymes break down food particles, so they can be absorbed by the small intestine.
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1. natural selection acts on existing traits because you can not evolve into something you didn't have
2. original structures evolve to accomplish new function in order to survive
