Question

which statement about the giraffes explains their evolution based on charles darwins main points?
the closest fossil ancestor to these giraffes would have a very short neck.
all three of the giraffes have an equal chance of reproducing regardless of the environment.
as a giraffe reached for food, the giraffe could make its neck longer making it better adapted to the environment.
long necks were a random genetic change and resulted in the gradual increase of organisms with long necks.

Explanation:

Darwin's theory of evolution emphasizes natural selection. Random genetic changes (mutations) occur. If a trait (like a long neck in giraffes) gives an organism an advantage (e.g., accessing more food), those with the trait are more likely to survive and reproduce. Over time, the frequency of the advantageous trait (long necks) increases in the population.

• The first option about the fossil ancestor having a very short neck is not directly based on Darwin's main points (natural selection on random variations).
• The second option is incorrect as in Darwin's view, the environment affects reproductive success (those better adapted are more likely to reproduce).
• The third option is more in line with Lamarck's theory (acquired characteristics) rather than Darwin's.

Answer:

Long necks were a random genetic change and resulted in the gradual increase of organisms with long necks.