Invertebrates make up what percentage of all animals?

Which of the following describes the body plan of a sponge?

What cells do sponges have that no other animal has?

The organs of more-comples invertebrates such as the earthworm contain in a body cavity called the ___.

Digestion of food particles in a sponge takes place in its ___.

Bath sponges have a skeleton made of a special protein called ___.

Sponges belong to the phylum ___.

Trichinella spiralis, the worm that causes trichonosis, is a ___.

The body parts of some inveretebrates are contolled by indiviual groupings of nerve cells called ___.

The body parts of a jellyfish is the ___, which looks like a ball with tentacles hanging underneath.

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