A signal is sent from a nerve cell to a muscle cell. What is this an example of?
A:Meiosis
B:Cellular respiration
B:intracellular communication
D:intercellular communication
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What will most likely happen when two bromine atoms bond together?

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

How many atoms or molecules are there in a mole of a substance?