Answer: The different layers are a result of lighter parts (such as the continental crust) settling at the surface level and heavier parts (such as iron and nickel in the core) settling in the middle. The layers separate by density, otherwise known as compositional layering. The earth did not always have these layers, as it had to undergo cooling to form some of them (like the continental crust).
Answer:
they need to introduce new deer and won't the earth worms and other such primary consumers will thrive because the deer are not there to eat them
Explanation:
The growth of plants and formation of land mammals characterized the paleozoic era.
