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Animal Classification

Across
The two ________ groups of animals are vertebrates and invertebrates
_______ have dry, scaly skin, are air-breathing animals, lay eggs with protective shells
Animal ______ helps us understand the world around us, understand an animal's needs and behavior
_______ are warm-blooded, breathe air, have fur or hair, give birth to live young, feed their babies milk
________ have spines/backbones
Down
_______ are cold-blooded but can live on land and water, have smooth skin, lay jelly-covered eggs, go through metamorphosis
________ do not have spines/backbones
______ live in the water, use gills to breathe, have scales, are cold-blooded, lay eggs