Acarbon atom has six electrons. how are these electrons shared in its atomic orbital shells

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.

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

Which type of neuron stimulates muscles to contract?