Which could be an example of an adaptive radiation?

a. a burst of new species in a new habitat where selective pressure is different from an ancestral habitat, like has been noticed for "darwin’s finches" the cichlid fishes and numerous examples from the fossil record.
b. human domestication of wild plants into crop plants due to selectively breeding plants with desirable characteristics over several hundred thousand years
c. descent with modification and natural selection

The correct answer will be option-A

Explanation:

Adaptive radiation is a process of speciation by which organisms get diversified into many forms very rapidly from an ancestral species.

The process takes place when the species gets into a new environment and new niches which results in morphological and physiological traits.

In the given question, the various forms of Darwin’s Finches on the same island is the result of adaptive radiation as the different forms of the beak of Finches is the result of different niches and the different food provided by nature.

Thus, option-A is the correct answer.

They diffuse within the water in the round pie plate

Explanation:

The molecules of the red dye will diffuse and gradually spread through the water in the round pie plate.

By definition, diffusion involves the movement of molecules of substances from the region of higher concentration to the region of lower concentration.

Once the the drop of the red food coloring reaches the water, its molecules diffuses out in the water till they are uniformly distributed in the water.