What can scientists learn by studying fossils? I HAVE ANSWER It is all of them.
how the Earth's climate has changed over time
how species have changed over time
the appearance of an organism and its structures
how the Earth's surface has changed over time

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Explanation:

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plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.