Under medium power magnification you count 15 skin cells across the field of view diameter. The diameter of the field of view is 200um. Determine the fit number

What are some things that limit population growth?

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.