Movement
They move by means of fins,
which are limbs adapted by swimming.
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Support
They have inner skeletons
made of cartilage or bone.
Protection
Their bodies have scales.
Circulation
Their hearts are divided into two chambers.
Respiration
They breathe with gills.
Reproduction
Their young develop inside jelly-coated eggs.
Pinegreenwoods Montessori
Montessori Zoology
