Answer:
The nervous system and circulatory system
Explanation:
Answer:
It is called Parathyroid hormone
Parathyroid hormone, also called parathormone or parathyrin, is a peptide hormone secreted by the parathyroid glands that regulates the serum calcium concentration through its effects on bone, kidney, and intestine.
The venom of a black widow spider is toxic to the nervous system.
Metrology. evolution biology
Too much carbon dioxide in the atmosphere can lead to global warming
this is why plants reduce the amount of carbon dioxide through photosynthesis
