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sponges are animals that have many: pores
water moves through a________ _________:( water moves out a hole in the top central cavity
they have specialized cells for obtaining________ and ______________ from the water food oxygen
segmented worms have long tube like bodies that are divided into segments
they are the simplest organisms with a true __________ __________ and ____________ contained in __________ nervous system blood vessels
a long _________________________ runs down the length of the worm's inner body digestive system
worms take in dissolved oxygen from the water through their skin
Created by: dedelee