Quote:
Originally Posted by jamesqf
Err... So why aren't all fish the same shape?
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Shapes for all animals have a great deal to do with what they eat.
The slowest of each species are the first to be eaten by the next tier on the food chain.Those which were a little 'faster', better camouflaged,or possess something else advantageous will go on to breed.
Reproductive strategies of existing species have allowed them to emerge or remain in the current environment.Countless species have already gone extinct.
Fish have only been around for a couple million years,and the Sun won't red-dwarf for about 4.5-billion years,so evolution of fish will continue steadily,albeit slowly until then,when Earth perishes just like billion of other planets have done already.
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All fish I've inspected are completely streamlined.You might have to turn them on their side to see it,but it's there.