Worms, Sponges, and Cnidarians

Flashcards covering key concepts from the lecture on worms, sponges, and cnidarians.

The three main phyla of worms are __, __, and __.

Platyhelminthes, Nematoda, Annelida.

Worms are __ that have long, narrow bodies without legs.

invertebrates

Worms get information about their environment through their __ that can detect vibrations.

sense organs

Flatworms are __ that live inside another organism and take food from their host.

parasites

Planarians digest food inside a __ where undigested food exits.

cavity

The main difference among the three main phyla of worms is their __ and appearance.

body shape

A sponge has a hollow bag-like structure with many tiny __ covering its surface.

pores

The stinging cells of cnidarians are used to __ their prey.

catch

Cnidarians expel undigested food through their __.

mouth

A coral reef is built by __ and provides a rich and diverse environment.

cnidarians

Worms have been classified based on their body structure and the specific __ they belong to.

phyla

Segmented worms have a __ digestive system with two openings.

one-way

The cells of a sponge help each other, especially the __ cells that trap tiny organisms.

collar

Planarians have a simple __ that allows them to detect light and dark.

nervous system

Earthworms act as __ by feeding on decaying plant material.

decomposers

The digestive system of worms has become more __ with the evolution of one-way systems.

complex