4. as the solar system formed, most of its mass became concentrated in one part of it. what is that that part?

Wht happens as electrons in the electron transport chain release their energy

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell