Answer: One of the has striped while the mother has none. And one fish is quite bigger than the other fish. They are similar because they are both fish and they both have tails.
In my backyard we have a little chicken who loves to consume corn just like me, but we are a little different.
In our backyard we have a big chicken who likes to eat corn all the time, I like to eat corn but not as much as him, and we re quite different.
Hope this helps :)
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