Evolution of Life on Earth

What were the earliest ancestors of all life on Earth?

• Reptiles

• Single-celled organisms

• Multicellular organisms

• Fish

What is one of the primary causes of evolution?

• Competition

• Mutation

• Fossilization

• Extinction

What do fossils provide a record of?

• Changes in species over time

• Environmental changes

• Ancient civilizations

• Catastrophic events

What is extinction?

• A form of fossilization

• A type of mutation

• The end of an organism or a group of organisms

• The beginning of a new species

What did some single-celled organisms evolve into over millions of years?

• Fish

• Reptiles

• Multicellular organisms

• Mammals

What are chordates?

• Reptiles

• Single-celled organisms

• Amphibians

• Organisms with a notochord

Which group of chordates evolved into the first vertebrates?

• Mammals

• Fish

• Amphibians

• Reptiles

What did amphibians give rise to?

• Primates

• Fish

• Reptiles

• Mammals

What group evolved from reptiles and are the ancestors of mammals?

• Chordates

• Synapsids

• Amphibians

• Primates

What group includes monkeys, apes, and humans?

• Synapsids

• Chordates

• Reptiles

• Primates