Which of these is a cost of recycling aluminum?

a. preserving earth's remaining aluminum reserves b. disrupting tropical rain forest plants and animals c. producing wastes that are toxic to animals
d. using energy to transport a heavy metal

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

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.

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations