Please help! I am having trouble on this exam! No links or will be reported and answer in detail so I understand. I am being nice today 100 points! :)

Before the discovery of the microscope, Linnaeus could classify organisms only into two kingdoms. More kingdoms were introduced later. What characteristic of science does this show? (5 points)

a
It is permanent.

b
It is changeable.

c
It is always accurate.

d
It is based on predictions.