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Giraffes originally had short necks. This trait made it harder for the giraffes to eat and survive.
Giraffes had many competition with other animals who would eat the same food as them. They started dying because they couldn't find enough food to survive.
The giraffes got their long necks from a genetic mutation. Their long necks helped them eat the food off of tall trees. By eating from tall trees, they have no competition for food by other animals
The giraffes with the trait of ling necks are more fit to survive. This trait will allow them to survive. The giraffes with the trait short necks will most likely die off.
Overtime, giraffes overproduced since many of them actually died from hunger. They needed to overproduce so that their species would not go extinct or in danger of extinction.
Most of the giraffes now have long necks. Long necks is now a trait in the gene pool.
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