Question

2. Which of the following is an example of evolution?

a. The ability of human adults to digest lactose.

b. A tall giraffe that can eat plants that other members of its species cannot reach.

c. A bacterium that survives antibiotic treatment.

d. All of the above are correct.

e. None of the above.

Answer 1

Ans d) All of the above options are correct

• Lactase is the enzyme which is responsible for the digestion of lactose(milk sugar). Babies always made lactase but after the weaning phase, the lactase production stops. The ability to digest the lactose by adults is clear evidence of evolution.
• During the scarcity of food, the tall-necked giraffe was more likely to survive than the short-necked giraffe because they were able to exploit the food resources that were unavailable to the short-necked giraffe. After many generations of this selective process, the descendant population has a much longer average neck length
• A bacterium that survives antibiotic treatment is an example of evolution by natural selection. Many of the bacteria now become resistant to the antibiotics that were once used to kill them