Logical Riddles for Internalists

I hope you find these useful and challenging.

#1 Proper function requires adequate functionality.
There is adequate warrant for all to accept that 1+2=3.
a. Human beings are justified in believing that 1+2=3.
b. Gorillas are justified in believing that 1+2=3. Can a gorilla do this? What if a gorilla could do this?
c. Sparrows are justified in believing that 1+2=3. Can a sparrow do this? What if a sparrow could do this?

#2 Does proper function require the presence of functional language suitable to the task of arriving at a justification? (Is language a part of proper function?)
a. The concept of zero had no warrant in 500 B.C. The language and theoretical concepts did not exist at that time.
b. The concept of zero has warrant today. The language and concepts have developed in the interim time.