Exam 18: The History of Life

Why is RNA considered by many scientists to have been the basis for early forms of life?

Prokaryotic cells evolved about _ years ago.

The earliest group of land animals was the

Some of the organic molecules on early Earth came from outer space.

The hobbit- sized hominin whose fossilized remains were recently discovered on a remote oceanic island belonged to the species

The fossil evidence indicates that amphibians evolved from _ .

In addition to Homo, another genus within the hominins is

The fossil record indicates that about 600 million years ago, a wide variety of _ animals had evolved in the oceans.

The idea that river mud left in the sun will turn into frogs illustrates

Experiments that attempt to simulate conditions on early Earth have produced results that hint at the possible origins of life. What have the experiments produced?

The experiments that demonstrated that meat does not spontaneously generate maggots were conducted by

Which characteristic sets hominins apart from other primates?

To survive successfully on land, plants needed to develop

Miller and Urey's experiments to simulate prebiotic evolution produced

The earliest life- forms were photosynthetic eukaryotes.

The oxygen that arose in early Earth's atmosphere was likely produced by organisms that were very similar to modern

One theory holds that the first self- replicating molecules were

An adaptation that is closely associated with hominin evolution is

Some RNA molecules have been discovered that can

An anaerobic prokaryote engulfs a prokaryote capable of using oxygen to produce energy. The anaerobe could now perform