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Hello,
Cheetah is definitely the mammal, and it was considered the fasted animal on land.
Let's see why all other three options are not correct
Cheetah could not be a reptile because they are not cold blooded animal which could regulate their inner temperature the same like the environment
Cheetah could not be a bird because it could not have any wings to fly
Cheetah could not be a fish because it could not able to swim with those 4 big legs, and they also could not have any fins to help them to do it. Hope it help!
Cheetah is definitely the mammal, and it was considered the fasted animal on land.
Let's see why all other three options are not correct
Cheetah could not be a reptile because they are not cold blooded animal which could regulate their inner temperature the same like the environment
Cheetah could not be a bird because it could not have any wings to fly
Cheetah could not be a fish because it could not able to swim with those 4 big legs, and they also could not have any fins to help them to do it. Hope it help!