Question

Suggested evidence of natural selection at work in humans is the observation of Select one: a. low hemoglobin levels despite high elevation in Tibetan populations over generations b. increase in hemoglobin level when the average person travels from low to high elevation c. an increase in body fat in preparation for winter months at high elevation d. increase in muscle mass from extensive weight training over several months e. mountaineers using oxygen tanks when climbing at high altitude

Answer 1

a. low hemoglobin levels despite high elevation in Tibetan populations over generations.

Step-by-step explanation:

Natural selection can be defined as a biological process in which species of living organisms having certain traits that enable them to adapt to environmental factors such as predators, competition for food, climate change, sex mates, etc., tend to survive and reproduce, as well as passing on their genes to subsequent generations.

Simply stated, natural selection entails the survival of the fittest. Therefore, the species that are able to adapt to the environment will increase in number while the ones who can't adapt will die and go into extinction.

A suggested evidence of natural selection at work in humans is the observation of low hemoglobin levels despite high elevation in Tibetan populations over generations. This is as a result of a low level of oxygen in the blood of a living organism such as humans.