1. Which of the following is NOT a key factor important to the development of human society? A. Access to clean water
B. Access to fertile soil
C. Access to cities
D. Access to natural resources

Which of the following systems in absorbing oxygen and releases carbon dioxide

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as