Answer:
(B) Similarities among Hox genes suggest that they all arose from a single ancestral gene that duplicated many times.
Explanation:
Hox genes are arranged in clusters and their order on the chromosome is the same as the order in which they are expressed along the body during development.
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2 ways to change the rate of a chemical reaction
Answer:
Increase the concentration of a reactant.
Increase the temperature of the reactants.