Answer:
c.Optional of
Explanation:
According to my research on different college structures, I can say that based on the information provided within the question the course entity of the college database would be optional of the department entity. This is because the college has many departments but only some offer courses, therefore the courses are dependant on if the department offers them or not (optional).
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Hat you want to ask, is what level in the food chain has the most energy at their disposal. The answer then would be the group at the bottom of the food pyramid. They would be closest to the original solar energy that was trapped by plants. Thus herbivores.... those that feed on plants... or those plankton feeders that feed on algae, should have collectively the most energy available to them.
<span>As one goes "up" the food chain/pyramid, the initial energy of the sun because of the laws of thermodynamics and the "work" of animals, is transformed into heat which is unavailable for "work". Thus the top carnivores have the least pool of energy available to them and thus their populations tend to be small.</span>
