Exam 19: A Slow Unfolding: the History of Life on Earth

Photosynthesis was first performed by bacteria about 3.4 billion years ago.

The oxygen present in Earth's atmosphere has been produced as a waste product of the process of ________.

Which of the following is the most likely candidate for the first eukaryotic life-forms to move onto land?

Lobe-finned fish gave rise to tetrapods that successfully moved onto land.

Compare and contrast the life-forms found in Domains Bacteria,Archaea,and Eukarya.

The gnathostomes were the first vertebrates to:

Which large animals were wiped out by the Cretaceous extinction?

Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?

The Cambrian explosion followed extinction of the dinosaurs.

The evolution of land organisms was not possible until enough ________ had been made by the early forms of aquatic life.

Primates first appear in the fossil record in the:

Sections of the geologic timescale are defined by:

Modern birds are probably direct descendants of:

The earliest evidence of life on Earth dates to about 3.8 billion years ago.

Which aquatic vertebrates are thought to be the ancestors of the amphibians?

The amniotic egg first appeared in which group of animals?

Both gymnosperms and angiosperms may be pollinated by animals.

An adaptation of arthropods that made them well adapted for life on land was an exoskeleton that can:

If a 10-mile-wide comet hit Earth,how would this likely affect the history of life?