Direct parasite lifecycles require how many host species to complete their lifecycle?

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Multiple Choice

Direct parasite lifecycles require how many host species to complete their lifecycle?

Explanation:
Direct parasite lifecycles are completed within a single host species, with development and reproduction occurring entirely inside that host. Because no intermediate host is needed, only one host species is involved to carry the parasite through all stages. If a parasite required an intermediate host to complete development—for instance, passing through different species such as a snail or fish—the lifecycle would be indirect and involve multiple host species. An example of a direct lifecycle is the pinworm in humans, where all stages occur within the human host.

Direct parasite lifecycles are completed within a single host species, with development and reproduction occurring entirely inside that host. Because no intermediate host is needed, only one host species is involved to carry the parasite through all stages. If a parasite required an intermediate host to complete development—for instance, passing through different species such as a snail or fish—the lifecycle would be indirect and involve multiple host species. An example of a direct lifecycle is the pinworm in humans, where all stages occur within the human host.

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