Which of the following ways does a person who utilizes radiation not use to minimize their dosage of radiation?​

Me with these questions image attached

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups

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.