How do enzymes speed up chemical reactions? enzymes
a. lower the activation energy of chemical reactions.
b. raise the temperature of the cell, speeding chemical reactions.
c. store atp, allowing more energy to be used in chemical reactions.
d. act as miniature 'transfer trucks', gathering materials for chemical reactions, and placing them together.

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.