Where does most of the oxygen in the atmosphere come from?

A.

the process of evolution

B.

the process of photosynthesis

C.

the process of respiration

D.

the process of cellular respiration

What type of community relationship does a grizzly bear and a salmon fish have

The covering on electric plugs and around wires is made of an what?

What's the difference between starch and glycogen

Common proteins are polymers of 20 different amino acids. How many amino acids are necessary for a protein polymer to have at least as many possible different sequences as there are atoms in the Universe?

Four events in nature are described below. Event 1: Ocean waters freeze. Event 2: Cool air masses meet warm air masses. Event 3: Ocean water becomes warm. Event 4: The sea floor shakes due to an underwater earthquake.

Which object in our solar system has the greatest density

Nearly all of what in your cells comes from your mother

Which system works with the circulatory system to move blood around the body?

How is carbon returned to soil

What's it called when a cat has white paws?