Characterization of the fishes
Characterizes the fishes in accordance to the examples of representing beings, skin, basic morphology, respiration, circulation, thermal control, nitrogen waste and types of reproduction?
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a) Examples of representing beings: rays, sharks, sardines, tuna, salmons.
b) Basic morphology: hydrodynamic body, fins;
c) Cartilaginous skeleton in the chondrichthyes, bony skeleton in osteichthyes.
d) Skin: with scales in the osteichthyes and placoid scales in chondrichthyes.
e) Respiration: branchial.
f) Circulation: incomplete, closed, heart with two chambers.
g) Nitrogen waste: urea in chondrichthyes, ammonia in osteichthyes.
h) Thermal control: heterothermic.
i) Types of reproduction: sexual, internal fecundation in chondrichthyes, external in osteichthyes.
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