Organisms are primitive and may be ancestors of us are many reasons that people can not tell that. What dinosaur extinction. There are several reasons.
As the primitive era, creatures and their ancestors might be logically that humans cannot yet tell whether the dinosaur extinction because of something which has many causes.
As a result of a very old and may be a father of us.There are many reasons why a man has not yet been able to tell me that dinosaur extinction because what that there are several reasons why.