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Chapter 15 - The Invertebrates

Across
Thin membrane separating the segments of an Annelid's body
A grouping of nervous system cells
The class that contains sea lilies and feather stars
Grinds food in an earthworm's digestive system
The opening of the water-vascular system in a starfish
A cell type found in sponges that beats its flagella to maintain a current
Ascaris are members of this phylum
Leeches are members of this phylum
Stinging capsules that many cnidarians posess
An animal that doesn't have a backbone
The phylum of the starfish
Tough outer layer secreted by the mantle that protects a mollusk
Down
The phylum containing sponges
The opening through which water enters a sponge
The class that includes snails
Has tiny teeth, and drags food into a mollusk's mouth
A description of planarians, it means the organism has both male and female parts
The type of skeleton that consists of a fluid filled sac surrounded by 2 muscular cell layers
Relating to the 'back' of an organism
Stores food in an earthworm's digestive system
Tubes through which a bivalve mollusk circulates water from the environment
The type of symmetry in which a cut made through the center will create equal halves, but a transverse cut would not