The answer is evolutionary!
I hope I was able to help. :)
B.
The main organs of the excretory system are the intestines.
For moderate-intensity physical activity, a person's target heart rate should be 50 to 70% of his or her maximum heart rate. ... For example, for a 50-year-old person, the estimated maximum age-related heart rate would be calculated as 220 – 50 years = 170 beats per minute (bpm).
Brainlest would be appreciated, have a great day.
