Which statements can be inferred from the Paleozoic era time scale? There was volcanic activity during the Paleozoic era.
Dinosaurs existed in the middle part of the Paleozoic era.
Marine organisms existed in the early part of the Paleozoic era.
Ammonites existed before the trilobites did during the Paleozoic era
Erosion and deposition were processes that occurred during the Paleozoic era.

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

explanation:

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.