Why is it difficult to classify some bacteria and archaea from each other?

According to the RNA Hypothesis it is believed that all living things came from a common ancestor. What evidence supports this theory?

Charles darwin viewed the fossil record as A) evidence that earth was a thousand years old - I know it isn't this one B) Useful support for his theory - I'm leaning towards this one C) interesting but unrelated to the evolution of modern species D)

What structure transports bile from the liver to the bile duct?

Whats an advantage of fruit production in angiosperms

What is the weathering rate of quartzite?

What is the arrangement of the earth, moon and the sun during a total lunar eclipse in December

the esophagus, stomach, and small intestines all function together. which level of organization is being described

A muscle cramp is a sudden, painful contraction of a muscle, during which movement is difficult. What is happening at the cellular level during a muscle cramp? A. The proteins in the myofibrils become denatured, preventing relaxation. B.

When designing an experiment to test a hypothesis, the experiment must be replicable?

What is the appropriate term for a group of all the individuals that can mate with each other living within a specified area?