Carbon, hydrogen, nitrogen and sulphur are elements found in living cells. which is the least common?
a. carbon
b. hydrogen
c. nitrogen
d. sulphur

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

Depending on the organism the number of in a cell may change

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?