The thermal convection that drives plate motion is caused by

A. Subduction

B. Gravity

C. An unequal distribution of heat

D. Sea-floor spreading and expansion

The postage stamp below shows the constellation orion. why would orion look odd to residents of the northern hemisphere?

Which two ideas did Darwin use to explain evolution?

Is a cells main function is to produce proteins to be excreted, such as on the pancreas, which organelles would you expect to be larger or more prevalent? Why?

One type of potential energy is chemical energy. This is energy stored up that is released during a chemical reaction. An example of this type of energy is

Why has tuberculosis become so difficult to treat after being diagnosed?

2. The heart is classified as a (n)

How long does it take for cocaine to leave out your Stream

Why is the tundra treeless? lack of sufficient water permanently frozen ground winters too harsh too many fires

Select the correct statement about antigens. A. One antigen may have many different antigenic determinants and may therefore cause the formation of more than one antibody. B. Only small antigens exhibit reactivity. C.

Which molecule is the source of basic material used for the production of glucose in the calvin cycle?