According to Chargaff's Rules, which of the correctly following pairs nucleotides in DNA? a. Adenine pairs with Cytosine, Thymine pairs with Guanine
b. Guanine pairs with Cytosine, Adenine pairs with Thymine
c. Cytosines pairs with Thymine, Guanine pairs with Adenine
d. None of the above

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.

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.