All mammals are warm-blooded animals. Is this statement true or false?

A. TRUE

All triangles have three sides. Is this statement true or false?

A. TRUE

All squares are rectangles. Therefore, if a shape is a square, it must also be a rectangle. Is this statement true or false?

A. TRUE

If all mammals are warm-blooded, then a dolphin, which is a mammal, is warm-blooded. Is this statement true or false?

A. TRUE

All birds have feathers. Therefore, if an animal does not have feathers, it cannot be a bird. Is this statement true or false?

A. TRUE