Porifera/Cnidarians/Worms (1ESO)

Aquatic animals that have radial symmetry. Their cells are grouped in simple tissues. Some have organs.

Which of these statements about worms is NOT true:

These are the simplest invertebrate animals. AKA sponges.

These flatworms inhabit humid climates and can be found in seas, rivers, and lakes.

Water, containing waste products, that leaves the central cavity, is released through this hole.

Cells situated in the external layer of the sponge.

Umbrella-shaped sea cnidarians are called _______.

The simplest animals that have bilateral symmetry and cephalisation of the nervous system.

Stinging cells with a coiled flagellum that can inject liquid into prey to paralyse them. They are found in the tentacles of jellyfish.

A hollow space inside the bodies of porifera that have radial symmetry.

Sac-shaped sessile cnidarians are called ________.

Parasites that live in the intestines of many animals (including humans).

This type of skeleton allows jellyfish to keep their shape by collecting water inside their cells.

Cells that form the pores which let the water flow through the porifera.

Cnidarians are

The concentration of nerve centers at the "head" of the animal's body is known as

Cells that coat the inner cavity, creating a flow of water.