2. 4000 years ago a population of cichlid fish were isolated in Lake Nagubago in central Uganda. Since then 5 new species have formed, distinguished by their differing coloration and mating rituals. These fish are

Since then 5 new species have formed, distinguished by their differing coloration and mating rituals. These five groups of fish are considered unique species because they do not naturally interbreed.There are five types of isolation that biologically prevent species that might otherwise interbreed to produce hybrid offspring. These are ecological, temporal, behavioral, mechanical/chemical and geographical.

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one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.