During a running race, a person's breathing rate and heart rate increase. These changes most directly help the person do which of the following? A. increase the rate of digestion.
B. decrease the rate of gamete production.
C. decrease the rate of protein synthesis in neurons.
D. increase the rate of cellular respiration in mitochondria.

In a certain region, children are considered economic benefits. a rising trend in the fertility levels of the region is observed. last year the fertility rate in that region was four children per woman. it is predicted that the fertility rate is going to be six children per woman due to increasing poverty. if the predictions are true then the population of that region will , resulting in