Dna is made of nucleotides which are composed of
a. a protein group, a sugar group and a nitrogenous base.
b. a phosphate group, a starch group and a nitrogenous base.
c. a sugar group, an amino acid group and a nitrogenous base.
d. a phosphate group, a sugar group and a nitrogenous base.

How is the carbon cycle related to global warming ?

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.

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?