Question

What is the main responsibility of the endocrine system?

regulate hormones
create growth spurts in teen boys
allow a mother to breast feed
regulate emotions

Answer 1

The main responsibility of the endocrine system is to regulate the body's growth and development, so I think your answer would be "create growth spurts in teen boys"
Hope this helps!

Answer 2

Since im pretty sure boys arent the only one with hormones or growth spirts, which are both symptoms of puberty, im gonna say regulate hormones