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).
The potential energy changes into kinetic energy. :)
The two cells go into interphase, preparing to split apart again.
<span>Molecular clocksC. take advantage of known mutation rates to estimate how long ago organisms shared a common ancestor.
All of the following are important properties of prokaryotes except
A. prokaryotes are used to make many products for humans.
All of the following patterns were witnessed by Darwin except that species vary
C. within very short spans of time.
The scientific name for a white oak is Quercus alba; the scientific name for a red oak is Quercus rubra.What does this tell you about the organism?
D. White oaks are grouped in the same species category as red oaks.<span>
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A desert is a hot wasteland covered with sand and a tundra is a frozen wasteland covered in ice
