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INVERTEBRATES

Across
Cell division that forms a hollow ball of cells
Egg and sperm
Digestive cavity with only one opening
Cannot make their own food
Down
Thin projections of tissue that are rich in blood vessels, providing a large surface for gas exachange
Animals with no body cavity
Shows how animals are related through evolution
A body cavity located entirely within the mesoderm
Describe an animal's shape, symmetry, and internal organization
Body parts arranged around a central axis