My daughter went through the “why” phase for a while when she was 3. I do my best to answer them because it’s a fun game. She’s trying to learn, and I’m here to teach her. At one point we got to the topic of our dog and she was like “Why is he a dog”

That one stumped me for a while before I hit her with “because his parents are dogs”. And then she went right for the “who are his parents” and that spun off into questions about dog breeding and how they used to all be wild wolves… It’s fun.