Match the following.
1. a reaction that absorbs energy
endothermic
enthalpy
precipitate
2. a reaction that releases heat
3. the amount of heat released or absorbed by a reaction
4. the solid formed as a result of chemicals reacting together
from a solution
exothermic

Approximately percent of the energy created by cell metabolism is used by the body to carry on its normal functions, such as respiration, digestion, reproduction, muscular movement, circulation, and cellular regrowth.

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 is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine