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Unit 18: Biology Part 1 Page 7 of 60

Molting: The process by which arthropods shed their hard exoskeleton in
order to grow.

Monogamous : breeding with only one partner per breeding season

Nematocysts: Specialized cells in cnidarians that can release a small thread-
like structure and toxins to capture prey.
Nematoda: Invertebrate worms that include the roundworms.

Nerve net: Interconnected neurons that send signals in all directions.

Nymphs: A developmental stage of insects, where the young is usually
similar to the adult.

Omnivore : Eating meat and plants

Opposable : able to move to touch all the finders

Order: Containing one or more families .

Oviparous: A method of reproduction where the young hatch after the eggs
have been laid.
Pentadactyl : having five fingers

Pheromones: Chemicals secreted by animals, especially insects, that

influence the behavior or development of others within the same species.
Phylum : Group of living things in the same kingdom with common
characteristics; a principal taxonomic category that ranks above class and
below kingdom.

Placental : group of mammals in which fetuses are nourished by a placenta

Placoid : Type of scale found in cartilaginous fishes made of dermal teeth

Platyhelminthes: Invertebrate worms that include the flatworms and
tapeworms.

Polygamous : breeding with multiple partners per breeding season

Polyp: Cnidarian with a cup-shaped body directed upward.

Porifera: Filter-feeders with sac-like bodies; known as the sponges.
Radial symmetry: A body plan in which any cut through the center results in

two identical halves.

Radula: A molluscan feeding structure, composed mostly of chitin.

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