Which example describes biological evolution?
a. over time, a caterpillar species becomes as green as the leaves it eats.
b. the average woman's dress size has increased over the last 50 years.
c. you are vaccinated against polio and are protected against the disease.
d. a tree branch is broken off and another grows in its place.

a.Over time, a caterpillar species becomes as green as the leaves it eats.

Explanation:

Evolution means the gradual formation of complex organisms from simple types, a process that usually take several years (geological time).

The gradual change happens as a result of continuous adaptation by organisms to ever changing environment.

Option b could have been considered along with option a, but evolution process takes much more than 50 years.

Hence, the correct option is a.

its d lol

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