When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? -2 -1 +1 +2

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

What was darwins theory of common decent