Question

which of the following best describes changes that occur during puberty? ch:31 the cardiovascular system becomes fully developed and allows for good blood flow. the endocrine system becomes fully developed and works to communicate to the body via the bloodstream. the brain and spinal cord begin to function and allow for communication to occur within the body. reproductive organs begin to function and the secondary sex characteristics appear.

Explanation:

Puberty is marked by sexual - maturity onset. Reproductive organs start functioning and secondary sex characteristics emerge.

Answer:

Reproductive organs begin to function and the secondary sex characteristics appear.