6th Unit 1 The History of Life on Earth, Lesson 2 Quiz

Fossils of the plant appear in recent rock layers but not in older ones.

It is impossible for the fossil record to show evidence of the drought.

Fossils of the plant are abundant right up until the present day.

Fossils of the plant are present in older rocks but disappear at a point in the fossil record.

increase in oxygen

decrease in oxygen

increase in carbon dioxide

decrease in carbon dioxide

remains of an organism preserved by geologic processes

a sinkhole formed by a retreating glacier

sedimentary rock that formed a long time ago

a crystal formation suspended from the ceiling of a cave

structures that will become adaptations when the environment changes

structures that are a remnant of the adaptations that the whale’s ancestors needed to survive on land

structures that grow and improve in function as they are used

structures that function at certain times of the year or under certain conditions

famine

drought

very small land animals

very large land animals

appearance of early human ancestors

end of the last glacial period

extinction of the dinosaurs

formation of Earth

fossils over 500 million years old

well-preserved land organisms

the remains of an ancient ocean

soft tissues of organisms preserved in great detail

increasing diversity of fossils in rock layers following an extinction

increasing complexity of fossils in younger rock layers

rock layers with no fossils

transitional fossils

largest mass extinction event in Earth’s history

first animals with exoskeletons appear

extinction of the dinosaurs

formation of Earth

An excitinction

A mass extinction

A species extinction

a land extinction