Which of the following statements about secondary succession is true? a. Secondary succession occurs in ecosystems that have no vegetation. B. Secondary succession affects ecosystems that are already established. C. Ecosystems require pioneer species to undergo secondary succession. D. Secondary succession can occur in areas without soil. Please select the best answer from the choices provided A B C D.

How is mitosis different in plants and animals? a. in animals, the cell membrane pinches together. b. in plants,the dna is one circular chromosomes. c. in plants, there are no sister chromatids. d. in animals, a new cell wall forms.

Which feature of a human community is similar to a niche in a biological community

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.