The selectively permeable cell membrane A. Allows everything to enter the cell
B. Allows everything to exit the cell
C. Allows certain things to enter and exit the cell

really dont know just need some points

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.