Which of the following describes the difference between nitrogen-14 and nitrogen-15?
a. nitrogen-14 has 14 electrons, 14 protons, and 14 neutrons; nitrogen-15 has 15 electrons, and 15 protons, and 15 neutrons.
b. nitrogen-14 has 7 electrons, 7 protons, and 7 neutrons; nitrogen-15 has 8 electrons, and 8 protons, and 8 neutrons.
c. nitrogen-14 has 14 electrons, 14 protons, and 14 neutrons; nitrogen-15 has 14 electrons, and 14 protons, and 15 neutrons.
d. nitrogen-14 has 7 electrons, 7 protons, and 7 neutrons; nitrogen-15 has 7 electrons, and 7 protons, and 8 neutrons.

Which of the four major uses is predicted to change the least by 2020?

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 describes the habitat of a frog?