Explain how oxygen enters your body and is used. Make sure you mention the organs used, chambers of the heart and in which direction the blood goes.

What is an organelle found in most eukaryotic cells described as "cellular power plants", because their primary function is to convert organic materials into energy in the form of atp?

The random changes in a population's allele frequencies are referred to as A. genetic flow B. genetic drift C. selective pressure D. artificial selection

Which is a function of the cell membrane? A. performs photosynthesis B. controls what enters and leaves the cell C. protects the external structures of the cell D. provides energy to the cell

During which phase of mitosis do chromosomes become condensed and appear visible?

The short, hair-like structures that propel paramecium through the water are called:

Which is an example of a pure substance? A. air B. salad C. hydrogen D. sugar water

Why it might be important to be able to remove DNA from as organism?

Which part of the sphenoid bone houses the pituitary gland? which part of the sphenoid bone houses the pituitary gland? the lesser wings the "seat" of the sella turcica the cribriform plate the foramen ovale?

Leaves with carotenoid pigment turn during the fall.

the breakdown of food into molecules small enough to enter the bloodstream is primarily accomplished by the