How are proteins and nucleus acids related

Which of the following is true of natural population a.) populations are all the individuals of a species living in a defined area b.) populations are all uniform in size c.) viable populations exhibit little, if any, genetic variation

Imagine that a mouse has white fur because of a mutation in its dna. which of the following conclusions can be drawn

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain