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Answer:
These are examples of a parasitic food chain.
Explanation:
Parasitic food chain is a type of food chain that starts from herbivore, but the food energy transfers from larger organisms to smaller organisms, without killing in case of a predator. Thus, the larger animals are known to be the hosts and the smaller living organisms which acquire nutrition from the hosts are known to be the parasites. In this type of food chain, either the producer or the consumer is parasitized. Therefore, the food passes on to smaller living organisms.
Example of parasitic food chain
For example, producers are consumed by herbivores, which are infected by parasites and these parasites are consumed by hyperparasites.
Another example of a parasitic food chain begins where trees are consumed by fruit-eating birds. Later, these birds feed on lice and other insects. And these insects feed on microscopic organisms like bacteria and fungi.