"" she said, collapsing with exhaustion. "I'm glad that's over with!" a Hey!
b Oh, no!
c Phew!
d Wow!

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.

Are the earth's ocean floor and continents the same age geologically? why or why not?

Types of scientific inquiry that biologist engage in that cannot be completely controlled