1. When exercising, a person's breathing rate and heart rate increase in order to supply the muscles with enough oxygen to produce ATP. What systems
are involved in this scenario?

2. When a person is cold, blood vessels near the surface of the skin contract
and less heat is lost to the environment. What systems are involved in this
example of temperature regulation?

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.