Which of the following best describes physical development during adolescence?

puberty occurs according to a set schedule that is the same for all individuals.

the development of secondary sex characteristics happens at a rate unique to each individual.

the development of secondary sex characteristics begins at the same time for adolescents.

individuals can expect few changes to their physical characteristics during adolescence.

The right answer is  B.

Puberty is a stage of development that is reached when reproductive organs are functional. In humans, it refers to the transition from childhood to adulthood. It is particularly notable for its rapid growth due to growth hormones and the development of primary and secondary sexual characteristics due to sex hormones, with notable behavioral changes including an increased need for sleep due to a shift in melatonin release.

Note that each teenager follows his own development and that there is no pre-established order.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation: