题目内容

Ecosystem have ( )major food chains

A. one
B. two
C. three
D. four

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Assume a population, at t=0, population size is N(0), ratio of population size change in one year to the size of the proceeding year. This model is ( )

A. geometric growth model
B. exponential growth model
C. liner growth model
D. logistic growth model

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The ratio of dry matter production to the assimilation of a particular nutrient element, usually expressed as grams per gram is called ( )

A relationship of two organisms living together (symbiosis) and one derives its nourishment at the expense of the other is called ( )