Which of these scientists contributed to evolutionary theory through the study of populations and survival

During binary fission, what events must occur before the cell splits into two new cells?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution