Which occurs just before a volcanic eruption?

Most of the time a earthquake happens

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Explanation:

To expand on the other persons answer, before an eruption the area around the volcano will most likely start experiencing earthquakes or tremors, this is because magma and chunks of rock are pushing through the earths crust. Other things are also common, such as hot springs near the soon to erupt volcano may change in temperature or new hot springs may form.

the answer is d.) homologous; have mammary glands