Biologists group living things into how many domains?

Researchers testing new drugs usually give the drug to one group of people and give placebos,

A DNA molecule is a polymer made of subunits (monomers) called

The information carried by a DNA molecule is in

A gene is

Organisms that possess homologous structures probably

We know a lot about fossil crabs, snails and corals, but not much about ancient seaweeds. Why do you suppose this is the case?

The fossil record of horses reveal that

The oldest fossils usually

Fossils of an ancient reptile called Lystrosaurus have been found in Africa, India and Antarctica. Which of the following best explains this distribution?

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