The answer is :
A population of birds with red feathers slowly changes to having blue feathers
Microevolution is a change in allele frequencies and can be caused by mutations, selection (natural and artificial), gene flow or genetic drift.
What's different from macroevolution is that this change happens over a shorter time when compared to macroevolution which is when big differences in the population happen.
From the options, a change in the colors of fethers seems like a microevolution that happened due to a mutation in the population over a period of time.
A scientific question is a question based on observations and that is testable. A scientific question is part of the scientific method. The first step is to make an observation. The next step is to ask a scientific question. The researcher then forms a hypothesis, designs and conducts experiments which will either prove or disprove the hypothesis. Irrespective of whether the hypothesis is proved or disproved, the researcher will formulate a conclusion and share the results with the scientific community.
C is your answer so pick c
<span> c. coal is too large to power cell work </span>