eli5 : how did different animals come from common ancestors
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Imagine a sea full of one kind of fish. They all eat the same thing and live the same way. One day, a fish is born with a mutation which gives it the ability to survive in shallower water and hence it can hunt in places the others cant. It passes this ability on to its offsprings, and one day an offspring gets the ability to live at even shallower water or even breath above water. This fish is now luch different to its ancestors in the sea, but the sea is stilk full lf the original kind of fish, because it was super good at being a sea fish. Now you have two species.
Next thing the shallow water fish has an offspring with front legs, which can crawl ashore. Now we have three species. This thing happens very gradually over millions of years with very small changes each generation.
For example, you might be a bit taller, smarter, or have better eyesight than you parents, and hence you are changing from the original humans.
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