Answer:
The one major change that occurred was the placement and organization of the electron.
Answer:
I believe C is the correct answer I think not a 100% sure
Explanation:
It is also possible to move substances across membranes against their concentration gradient (from areas of low concentration to areas of high concentration). ... If the energy of ATP is directly used to pump molecules against their concentration gradient, the transport is called primary active transport.
Hope this helps
Circulatory system
The circulatory system is the transport system for endocrine information. While the nervous system uses neurons, the endocrine chemicals and hormones must circulate through the body via blood vessels. Many glands in your body secrete hormones into the blood.
The answer is 15 so idrk ahahah jk