Discussion
When a robin eats an earthworm, the following happens ?
Answer: A
The key's answer is that detrital food webs can contribute energy to grazing food webs.
An earthworm feeds on dead organic matter, so it belongs to the detrital food web, which starts from detritus rather than living plants. A robin is a predator in the grazing web. When the robin eats the earthworm, energy that entered the system as detritus passes into the grazing food web, showing that the two webs are linked.
The reverse direction, grazing to detrital, happens when organisms die or excrete, not here. The earthworm is a detritivore, not a herbivore, so the eating is not a transfer from producers to primary consumers, nor from primary to secondary consumers of the grazing chain.
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