Random mutations are the ultimate source<span> of </span>genetic<span> variation. Mutations are likely to be rare and most mutations are neutral or deleterious, but in some instances the new alleles can be favored by natural selection.</span>
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Fossils document the existence of now-extinct species, showing that different organisms have lived on Earth during different periods of the planet's history. They can also help scientists reconstruct the evolutionary histories of present-day species.
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Hopes this helps!
Crossing over is the process whereby homologous chromosomes are pulled to opposite poles of the cell.
I'm guessing C because the crocodile mom is protecting the babies
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los jentes no puede acer casa de madera oh no poder acer dibujos o cosas de marina porque en este mundo todos usamos madera de arboles