Which of the following would cause a decrease in a population's size? A
immigration
B
increased natality
C
decreased death rate
D
emigration

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

What is the ecological role of food chains and food webs