Please answer this questions of Health subject

When exercising, you shouldn’t go past to avoid an injury.

Me d: which system contains the heart, blood, and blood vessels? a. muscular b. circulatory c. respiratory d. digestive which system contains the pituitary, adrenal, and thyroid glands? a. respiratory b. circulatory c. endocrine d. reproductive

Where does a fertilized egg spend most of its time?