Lower vertebrates {fish} (Pisces) have one heart with one vena cava entering auricle, one auricle connecting to ventricle, and one aorta leaving ventricle. Fish have vascular gills. They have scales. Females lay eggs in water that males cover with sperm. Fish have ears. They are streamlined. They move by swishing tail right and left. They steer with fins. Fish include jawless fish (Agnatha), extinct jawed fish (Placodermi), cartilaginous fish (Chondrichthyes), and bony fish (Osteichthyes).
Biological Sciences>Zoology>Kinds>Fish
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Date Modified: 2022.0224