With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.
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Why is choosing a direction necessary? </h3>
It nearly appears obvious that the giraffe's long neck developed as a result of a lack of food in the lower branches of trees. The giraffe has a significant advantage because it is taller than any other mammal and can feed where few others can.
When compared to modern giraffes, the giraffe's ancient predecessors had a shorter neck. The plants that were lying at a higher level were inaccessible to them. Giraffe phenotypes have changed in various ways, and now have long necks to reach vegetation that is higher up. The extreme form is chosen above other features in directional selection. It was decided to choose the long-necked giraffe over the short-necked.
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The correct answers are "cardiovascular diseases and cancer."
Cardiovascular diseases is a classification of illnesses that involves the heart and the blood vessels of the body, which may sometimes lead to a heart attack. While cancer is described as an abnormal cell growth inside the body of a person causing an invasion of a specific part or organ of the body, which may also spread if not treated well. The most common cancer for men is the prostate cancer, on the other hand, the common cancer seen in females is breast cancer.
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