The large diversity of biological molecules depends on atoms of the element this element can make stable bonds to itself and to atoms of other elements. without this element, the large macromolecules that make up most of the molecules in living organisms would not be possible.
a. carbon
b. hydrogen
c. nitrogen
d. oxygen

B) hydrogen

(example: hydrogen bonding in water)

if he does not use open the compass the a width greater than half of po, he will not be able to find the midpoint of the line, without the midpoint of the line, he will not be able to bisect the line.   to find the midpoint of a line the circles drawn with a compass must either intersect or be touching.