Which one of the following choices best represents a short-term benefit of cardiorespiratory fitness?
a. it decreases the risk of heart disease.
b. it relieves stress and boredom.
c. it increases stamina and reduces fatigue.
d. it decreases the chances of viral illnesses.

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?