Which of the following, if any, is not a common cellular activity?

a. Cells respond to the environment.
b. Cells develop and maintain complex organization.
c. Cells take in and use energy.
d. Cells regulate their internal environment.
e. All of the choices are common cellular activities.

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.

Can a trait be both polygenic and have multiple alleles? explain why or why not.

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?