Scientists monitor the effects of a deadly parasite in a host. What trends will they most likely see?
1. As the parasite population increases, the host population decreases.
2. As the parasite population increases, the host population increases.
3. The host population decreases only if the parasite population decreases.
4. The host population will remain the same regardless of whether the parasite population increases or decreases.

A parasite is an organism that lives on or in another organism and feeds on or at the expense of that organism.
They form a parasitic relationship with host, in which the parasite, feeds on another organism, the host, causing injury and possibly death to the host.
The parasite dwells on or inside the host's body.
Tapeworms, fleas, and barnacles are examples of parasites.

What is host?

"A host is a larger organism that hosts a smaller organism, whether it be a parasitic, mutualistic, or commensalist visitor. Typically, the guest is fed and has a place to stay."

Here, the scientists are dealing with a deadly parasite, which means that it is harmful for the host. So, if the parasite increases, the host decreases because the parasite will feed on the host which will eventually lead to their death.

Hence, the correct option is 1. As the parasite population increases, the host population decreases.

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