During which of the following life periods do people tend to spend the most time alone?

When does the process of myelination, or the development of myelin sheaths around a neuron's axon, start to take place?

a) before birth b) immediately after birth c) during puberty d) during late adulthood

The fetal stage occurs between

A) conception and 2 weeks. B) 3 weeks and 8 weeks. C) 9 weeks and birth. D) the onset of labor and delivery.