Which among the following organisms is/are not monoecious?NereisEarth wormLeechBoth A and C

The term "monoecious" refers to organisms that have both male and female reproductive organs in the same individual.

1. Nereis: Nereis is a genus of polychaete worms in the family Nereididae. They are dioecious, meaning they have separate sexes, so they are not monoecious.

2. Earthworm: Earthworms are monoecious, meaning they have both male and female reproductive organs in the same individual.

3. Leech: Leeches are also hermaphrodites, meaning they are monoecious.

So, among the given organisms, Nereis is not monoecious. Therefore, the answer is "A. Nereis".