The skin functions as a barrier to prevent the entry of microorganisms.
Technically speaking, an intrusion is any formation of intrusive igneous rock; rock formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock; rock formed above the surface of the crust.
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Answer:
natural selection would be the answer
Explanation:
That means that some of the animals would survive.
