About 500 million years ago, trilobites such as this were common that once covered much of indiana. violent storms often occurred in the same area and the trilobites were covered quickly by sediment, hidden for hundreds of millions of years.

a. along riverbanks
b. in the sandy plains
c. in warm, shallow seas
d. throughout the mountains

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

genetic variation will increase because of a new habitat and food source.

explanation: