Question

A successful parasite is the one which
a. Grows rapidly.
b. Reproduces fast.
c. Sticks to the host for a long time.
d. Keeps its host alive.

Answer 1

Hint: Parasites are organisms that survive during or during a host organism and obtain their food from or at the expense of their host. The parasite uses the host's resources to fuel its life cycle. It uses the host's resources to take care of itself. For a parasite to be considered a “successful” parasite, it's to possess the subsequent characteristics.

Complete answer:
A parasite depends on its host to remain alive. Killing the host before the reproduction destroys the parasite also because it needs a number to supply its progeny generation after generation. This makes option D correct.
In order to stay the host alive to supply many generations of parasite offspring, it's necessary for a parasite to subsided virulent or gentle over many generations. This makes option A incorrect.
Fast reproduction produces a rise within the number of parasite offspring but poses an additional burden on the host and makes the host survival harder. This makes option B incorrect.
Similarly, sticking too long to a number decreases its survival chances, and hence, the parasite keeps switching the host over time. Option C is wrong.

Thus, the right answer is option D.

Note: A successful parasite must possess a portal of entry and reproduction within the host. The parasite must even have mechanisms for locating a replacement host and avoid killing the host. A successful parasite must even be much smaller than the host and sleep in or on the host for an extended period of your time undetected.