When an athlete began running both her breathing and heart rates increased. the athlete’s breathing and heart rates increased as she was running because the athlete needed to:

Hey!

The heart rate INCREASED beacuse the Athlete needed to take in more oxygen...

The breathing rate INCREASED to get rid of Carbon Dioxide...

Explanation:

CO2--poisonous for cells in the Human body...breathing it can kill AND the CO2 is produced MORE as she execises as respiration happened quicker...

Oxygen---more oxygen presence aides the rates of respirartion and reduces the chance of OXYGEN DEBT = The lack of oxygen can lead to damage to muscles as LACTIC ACID is produced (poisonous for muscle cells)

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: