What are Dna and Rna’s main functions?

Which sentence best expresses the differing opinions of these two book reviews?

As a small change in a person's dna can cause a genetic disorder

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.