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Animal Characteristics

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Across
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Internal skeletal structure.
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The outer layer of cells that develop into the nervous system and skin.
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Animals without a backbone.
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Fertilized egg.
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Occurs when the sperm and egg combine inside of the animal.
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Two-cell-layer sac with an opening at one end.
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Hard or tough outer coverings that provide a framework of support.
Down
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Occurs when the sperm and egg combine outside of the animal.
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Forms between the endoderm and ectoderm layers and develops into the muscles, the circulatory system, and excretory system.
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Fluid filled ball of cells.
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Animals with a backbone and an endoskeleton.
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The inner layer of cells that develop into the digestive organs and digestive tract.
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Both sperm and eggs in the same animal body.