Why do some people argue that scientists should not use embryonic stem cells in medical research? A. They think research conducted on these stem cells is not applicable to adults.

B. They think the use of these stem cells is too expensive.

C. They think the use of these stem cells is the same as ending a life.

D. They think research conducted on these stem cells is too difficult.​

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.