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.  

integrated circuit (ic) is defined as a set of electronic circuits on one small flat piece of semiconductor material, normally silicon. a functional electronic circuit requires transistors, resistors, capacitors, inductors, etc., and the connections between them.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: