It is in the nature of the animal to act as how their biological parents did. Genetically something in the brain keeps the "tradition" ongoing.
The term Multicellular best describes an organism that can contain upto five levels of organization to carry out life functions.
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The amazing process begins with the female digging a hole in the gravel with her tail. A female salmon will lay a few thousand eggs in the hole that will be fertilized by the male fish. Eventually the new baby salmon hatch out of these eggs.
Crest - The highest part of a transverse wave. Trough - The lowest part of a transverse wave. Wavelength - The distance between one crest and the next in a transverse wave. Amplitude - The height from the resting position to the crest of the transverse wave.
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