How do the geographic barriers affect the relatedness of species?

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.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

In the water cycle , when does water undergo a chemical change