The graph below is an age-structure diagram for a population of African elephants.
Age-structure Diagram of African Elephants
Males
Females
Age class
> WOUMTI
Key
Class Age (years)
А 0 - 9.9
B 10 - 19.9
с 20-24.9
D 25 - 34.9
E 35-49.9
F > 50
10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10
Number of individuals
According to the diagram, what happens to the female population between
the ages of 9 and 19?

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.