Final answer:
Darwin's first hypothesis on evolution emphasizes descent with modification as species share a common ancestor but change over time through heritable traits passed on by genes.
Explanation:
Descent with modification is a key part of Darwin's first hypothesis regarding evolution. It refers to the idea that species share a common ancestor but change over time, resulting in new species with variations from their parents. This concept highlights the importance of genes getting passed on as a mechanism for heritable traits that drive evolutionary change. On the other hand, acquired characteristics are not part of Darwin's first hypothesis, as evolution is mainly driven by genetic variations passed down through generations, not characteristics acquired during an individual's lifetime.
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