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Extra Credit (worth 1 pt) According to your text there are two molecular interpretations of post-reinforcement (ore pre-ratio) pausing during fixed schedules of reinforcement. Please briefly explain one of those interpretations. In other words, what is one molecular account of pausing during fixed ratio schedules of reinforcement? For full credit, you must name and explain the molecular account of pausing that you have identified. 

Tropical rain forests have nutrient-poor soils

A key set of experiments conducted in the intertidal zone during the late 1960s is best known for the removal of which keystone species?

You are working on the great lakes on a science barge sampling water. Where do you expect to find the most plankton and floating algae?

Find the sum of an arithmetic series (5pts)

Please confirm on your paper that you have read and understood the test instructions. (1pt)

Find the center, foci, and vertices of the ellipse. Then graph the ellipse (8pts) (Hint: You can use the information from the image to guide you 

Find the center, transverse axis, vertices, foci, and asymptotes of the hyperbola. Then graph the hyperbola (10pts)

The sequence is defined recursively. Write the first four terms. (5pts) a1 = 2, a2 = 5; an = an-2 – 3an-1

Solve the problem. Round your answer to the nearest tenth. (6pts)A wagon is pulled horizontally by exerting a force of 60 pounds on the handle at an angle of 25° to the horizontal. How much work is done in moving the wagon 50 feet? (Hint: