Why is the earth’s core made up mainly of iron while the crust contains mostly silicate minerals? a. because iron melts and silicate minerals do not b. because iron is less dense than silicate minerals c. because silicate minerals melt and iron does not d. because iron is denser than silicate minerals

Which technically is nasa developing that will astronauts reach mars

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

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.