Genetic variation. We all have different gene expressions and often times we have different parent cells than somebody else of the same species, though, it's possible to share similar characteristics.
Theory can be changed based on new research but law is backed up with immense info and is has not been broken once
A protein is made up of amino acids.
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Answer:
The reactions that occur when acid rain hits a brick building
Explanation:
The passage mentions what a biochemical process is, biochemistry combines chemistry and biology. With this alone, we know that acid rain is apart of biology, and the reaction is has on a building is chemistry.
