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Animal Characteristics

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