The answer is Circulatory System. It is responsible for moving blood and oxygen around the body, etc. (Brainiest answer plz and thank you) Hope this helped!
Answer:
Their bodies are smaller and they body systems are underdeveloped.
Explanation:
Think about concentration when 'containers' of liquid contain different volumes.
Gives man deeper voices and most man with a high level of testosterone tend to have a lot of hair on their body.Correct me if I'am wrong.