What determines all the stars properties such as its temperature size brightness or luminosity and life span

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 element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?