A teacher is introducing the concept of mammal for the first time to young children. She provides the definition and then she gives the following positive instances. She also includes some negative instances from other animal groups. When the students try to classify positive instances as mammals, they struggle.
Cow, horse, donkey, cat, dog, mouse

3a.What type of concept lesson format is she using, rule-eg or eg-rule? Explain your answer. (Consult the Lesson 7 mini-lesson.)

3b. Define correlational feature, and then provide an example of a correlational feature that students might incorrectly believe is a defining feature because of the list of positive instances used in the mammal lesson.

3c. Define irrelevant features and then provide an example of an irrelevant feature that students might think is a defining feature based the list of positive instances used in the mammal lesson.

3d. Define undergeneralization and explain why that type of error is likely given the list of positive instances used in the mammal lesson.