Select items observed by Darwin in Argentina during his journey on the H. M.S. Beagle that resulted from massive geological changes. a. Deeply eroded rivers with exposed layers of sediment.
b. Raised beaches with exposed layers of sediment.
c. Fossilized bones of extinct mammals.

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.

Which of the following is a common response to cell signaling?

What material did the moon come from?