1) A steady-state in which the composition of the populations does not change. a) Equilibrium b) histogram c) commutative d)   2) Organisms that belong to a group similar to each other and are usually distinct from other organisms. a) species b) macroevolution c) life d) microevolution 3) What does reproductive isolation mean?  a) members of groups don't mate outside their group b) all members from all groups mate c) the natural way of life 4) What book did Darwin eventually published?  a) On the Origin of Species by Means of Natural Selection b) Natural Selection c) The Origins of Humanity d) The Humanity

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