Create a Venn Diagram comparing and contrasting Primary Succession to Secondary Succession using the phrases below:
*starts with previously existing soil
*gradual growth
*happens relatively fast
*happens relatively slow
*lichens break down rock
*starts on bare rock
*Pioneer species
*previously existing life
*no previously existing life
*starts as the result of a volcano or receding glacier
*starts as the result of a forest fire or flood
*climax community
*comes after a natural disaster
*plants and animals adapt

Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells

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.

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review