At the onset of puberty, a. there is substantial gray matter growth b. the risk of schizophrenia decreases c. brain development is virtually complete d. the brain has completed its adult development

The correct answer is option a, that is, ​there is substantial gray matter growth.

Explanation:

Till the age of six, the brains become 90 to 95 percent of the size of an adult's brain. However, the brain still requires many remodeling so that it can work as the brain of an adult. Some of the modifications in the brain take place prior to puberty, while some take place afterward. The modifications in the brain take place on the basis of age, hormonal changes and experience in puberty.  

The gray matter increases at the time of early puberty is that since the time of birth the gray matter is weeded out spontaneously so that the individual can learn more effectively and can use the fundamental functions like walking and talking, along with other functions easily.  

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

the answer is c on e2020, bud.