The Bear class is an abstract class inheriting from Blank $1$ Question $8$

$.$ It does not implement an interface or have any abstract methods. Classes such as Bear may have many Blank $2$ Question $8$

such as BrownBear but BrownBear can only inherit from one Blank $3$ Question $8$

$.$ It would have been possible to constrain behaviour in BrownBear by adding Blank $4$ Question $8$

methods with the same Blank $5$ Question $8$

in Bear, for example for foodFrequency. This could also have been done by having Bear or Blank $6$ Question $8$

implement an appropriate Blank $7$ Question $8$

containing the abstract method foodFrequency. An advantage of this would have been that it could have been implemented by classes Blank $8$ Question $8$

Bear. It's also possible for such classes to implement Blank $9$ Question $8$

interface even though they can inherit from Blank $10$ Question $8$

superclass.