Question

what is the third principle of natural selection?
organisms in a population are all equally fit in
their environments
all organisms survive and there are always
plenty of resources so there is never a struggle
for existence
there is an overproduction of offspring in a
population which leads to a struggle for
existence

Explanation:

The principles of natural selection include variation, inheritance, and the struggle for existence due to overproduction of offspring. The first option is incorrect as organisms in a population have varying fitness. The second option is wrong because resources are limited, leading to a struggle for existence. The third option correctly states that overproduction of offspring leads to a struggle for existence, which is a key principle related to natural selection (the third principle involves the struggle for existence from overproduction).

Answer:

The correct option is: There is an overproduction of offspring in a population which leads to a struggle for existence (the third option in the list, with the checkbox next to "There is an overproduction of offspring in a population which leads to a struggle for existence").