What is a common ancestor? A. An animal that has a lot of offspring
B. An animal from which two or more different species evolved
C. An animal that is related to many other species
D. An animal that’s good at escaping from predators

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Which type of respiration takes place when there is no oxygen present

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