Gravity causes:

a-objects to repel one another

b-objects to attract one another

c-objects to rotate around one another

d-objects to resist motion

How can you tell the difference between rough er from smooth er?

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Approximately what wavelength of light is best absorbed by chlorophyll a