by there behavior and the way they look
Jawless fish, cartilaginous fish, and bony fish.
Class Agnatha
The three major groups of fishes are:Jawless Fishes-have no jaw, but a roundmouth, a tube like body made of cartilage (flexible, like your nose), no scales; have slimy skin. Examples: lamprey and hagfish (google them).Cartilaginous Fishes-skeleton made of cartilage, movable jaws, have scales. Examples: sharks, skates and rays.Bony Fishes-skeleton made of bone, 95% of all fish species, covered by bony scales, have a swim bladder (helps fish keep balance), reproduce by external fertilization called spawning; some species have internal fertilization. Examples: perch, bass, northern pike, salmon, and goldfish.Thanks to SIS for the Life Science notes, taken on Friday, May 21st.-sylvesterrose12
Three basic fish groups: Cartilaginous Fish - Chondrichthyes Fay-Finned Fish - Actinopterygii (over 23,000 species) Lobe-Finned Fish - Sarcopterygii
tibretin
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fat fruit grain
Archaea, Eubacteria, and Eukaryota
Kurds, Sunni, and Shiites.
# Steroids # cholesterol # triglyceride
the three major groups are crustaceans spiders and inscets
Tropical, temperate, and arctic are three major climate types.