When you move your fingers to type a text message, you are using motor neurons of the • somatic nervous system • sensory nervous system • autonomic nervous system** • central nervous system

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Explain how organisms could be harmed by high levels of salt from roadways?

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis