Species can vary in several ways. Which of the following is one of Darwin's ideas that was accepted by most scientists of his time due to the large number of fossils being discovered at that time?
A. Species vary around the world.
B. Species have specific adaptations to their local environment.
C. Species that live in seawater can also live on mountains.
D. Species change over long periods of time.
Take giraffes for example, they used to have short necks in the past but needed longer necks to reach leaves on the tree. So eventually they stretched their necks so much, only the ones with necks long enough to eat survived.
