Primitive (ancient) bacteria such as methanogens, halophiles, and thermophiles live in extreme conditions, such as salty environments and hot or acidic water.  They belong to this domain.

Negatively charged, subatomic particles of atoms, with almost no mass are called

Which of the following kingdoms does not belong to the domain Eukarya?

Which of the following organisms are prokaryotic?

Which of the following is not a part of Darwin’s theory of evolution by natural selection?

The first energy level of an atom can hold 2 electrons.  All other energy levels hold ___ electrons.

Which of the following pH values is considered acidic?

Atoms with the same atomic numbers but different number of neutrons are called _____________. Some may be unstable and radioactive

Which of the following is not one of the three domains?

In comparative anatomy, structures that are anatomically similar because they come from a common ancestor (like the bones that make up the flipper of a whale and wing of a bat) are known as: