The population of slugs if the population of thrushes decreases will decrease. Thus, option "C" is correct.
A food chain is a sequence showing the nutritional dependence of one organism over the other in an ecosystem. In order words, it refers to a linear and sequential nutritional relationship between different organisms in an ecosystem. For example, the insects in an ecosystem feed on grasses, frogs feed on the insects, snakes feed on the frogs, and birds pick on snakes for their food in the same ecosystem. Thus, the food chain becomes:
grasses ---> insects ---> frogs ---> snakes ---> birds.
Thus, option "C" is correct.
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