7. Find a counterexample for the statement.

All animals have fur.

A frog is an animal but doesnt have fur.

Step-by-step explanation:

It is not a Mammal

A lizard is an animal but doesn't have fur.

Step-by-step explanation:

A counterexample would be to give an example of an animal that doesn't have fur. So the premise is met: there is a clear example of what one considers an animal, but the animal doesn't have fur.

For example a lizard is clearly an animal, but it doesn't have fur around its body. One needs to just find one example that negates the given statement to make it false.