Which automatic system conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure?
a. peripheral nervous system
b. sympathetic nervous system
c. somatic nervous system
d. parasympathetic nervous system

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000