Question

6. Deer mice have been observed to change their coat colours from dark brown
to light brown when they migrated to the sandhills of Nebraska which eventually
allowed them to hide better in the sand and thus avoid predators. According to
scientists, this change came about through just one genetic mutation. What type
of selection led to this phenomenon? Explain in one sentence. ​

Answer 1

$\rm\huge\underline{Answer}$

The heart has four chambers:

The right atrium receives blood from the veins and pumps it to the right ventricle.

The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.

The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.

The left ventricle (the strongest chamber) pumps oxygen-rich blood to the rest of the body. The left ventricle’s vigorous contractions create our blood pressure