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The top documents tagged [heart nervous system]
Fishes Lesson 4. -Aquatic vertebrates (they have backbones) -Most have paired fins, scales on some parts of the body, and gills. -Fins are for movement
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Stages of Development Overview Development of the embryo is broken into 3 Trimesters each with 12 weeks Up to the 9 th week=embryo Beyond 9 th week=fetus
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