Blood flow in arteries pulses with cardiac cyclesystolic pressure
I think I hope this helps
Precipitation draws the water back to Earth in the form of rain, sleet, and snow. hope this helps.
C.organ
because stems, roots and leaves are not seen b with microscope, they are not tissues but organs. and not organ system because root system etc are organs systems
May be I have not explained well but it is the correct option.
