Answer:
i believe its the electron transport chain
Explanation:
A.
The respiratory system transports oxygen and other nutrients to the heart for the circulatory system.
I hope this helped you hon
Homeostasis is maintained by negative feedback loops within the organism. In contrast, positive feedback loops push the organism further out of homeostasis, but may be necessary for life to occur. Homeostasis is controlled by the nervous and endocrine systems in mammals.
No they like to kill theyre own food and are very protect of therye food