A, An ancestor of whales had legs. Hope i helped! :D
the answer is, the bottom layer is the oldest. hope this helps.
Answer:
the area of the habitat (relative to the population size)
Explanation:
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Answer:
Synthesis
Explanation:
A synthesis chemical reaction is where two simpler substances form together to create a more complex product.
The reactants can be either a single element or a compound, but the product is always a compound.
Since Mg and O2 reacted to create MgO, a compound, this represents a synthesis reaction.