Question

Nereis is an aquatic annelid. Its parapodia help it__________.

Answer 1

The term "lateral appendage" refers to limbs on the sides of the body. Sections of the mouth, parts of the tail, gills in many animals, and legs for walking, climbing, and other activities are examples of appendages. Appendages assist in moving from one location to another, as well as feeding and grooming. The flagella of bacteria is an example of lateral appendages.

Complete answer:
Nereis is an annelid that lives in water. It can swim through its parapodia. Nereis is a Polychaeta worm genus in the Nereidae family. For locomotion, they have setae and parapodia.
Except for the peristomium and the anal segment, every segment of the body has a flat, fleshy, hollow, vertical flap-like protrusion termed parapodia on either side.
Nereis and other aquatic annelids have lateral appendages called parapodia that aid in swimming. The phylum Mollusca has animals with a mouth that has a file-like rasping apparatus called radula for feeding. Sexes are separate (dioecious) in Aschelminthes animals, i.e. males and females are distinct.
Nereis is a polychaete worm genus. It contains a large number of species, the most of which are marine. For locomotion, Nereis have setae and parapodia. They may have two different forms of setae on their parapodia. Support is provided by acicular setae. The bristles on the Polychaeta's exterior are called locomotor setae, and they are used for crawling. They have a cylindrical shape and are adapted to burrows. They are found not only in sandy areas. They frequently cling to seagrass or other grasses on rocks, and they may congregate in big quantities. They are extremely harmful to touch, causing excruciatingly painful long-term burns. Rag worms and clam worms are typical names for Nereis worms.

Note:
Osmoconformers are Nereis. They are dioecious (individuals are either male or female) and spawn by releasing their haploid gametes into the water. Nereids also develop a larval stage that is comparable to that of mollusks, namely a trochophore larva, after fertilisation and mitotic divisions of the zygote.