Which of the following statements is true concerning feedback mechanisms?

a. blood glucose levels are regulated by positive feedback mechanisms.
b. negative feedback mechanisms work to prevent sudden severe changes within the body.
c. positive feedback mechanisms always result in excessive damage to the host.
d. negative feedback mechanisms tend to increase the original stimulus.

Give an example of a trait that is controlled by more than one gene.

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.

Which of these outcomes is a negative impact of postindustrial societies on the environment? a. nomadic ways b. overpopulation c. overgrazing d. resource renewal