It would be d because a cell is least complex and organ system is most complex
The skull is designed to protect the brain.
Answer:
When oestrogen rises to a high enough level it causes a surge in LH from the pituitary which causes ovulation where an egg is released from the follicle (Day 14 of the cycle). The follicle becomes the corpus luteum and this produces oestrogen and progesterone which inhibit FSH and LH production by the pituitary.
Explanation:
Water gains energy during evaporation and releases it during condensation.
Answer:
to break down food
Explanation:
and also to absorb nutrients