A kid that asks why becomes wise.
A mom that says why is wise.
A kid that uses "why?" out of a desire to avoid tasks can be gently kept on track by a mother that suggests her availabilty to answer questions is best done while working together. There also is the option of writing down the questions on a "Why Board" that you can return to later, especially if you are in a hurry to get somewhere. The trick is keeping life productive during those times when the questions are asked, but there isn't time to research indepth and contemplate together.
Keep the questions coming though.
If a child becomes belligerent and demands answers, moms can remind that learning is best done under conditions of mutual respect.
Kids will be just amazed at how everything is so interconnected.
I especially like those opportunities that arise when we can draw connections to their inner source of wisdom. In each of us, kids are not excluded, there is an internal kind of discernment that will help them weigh their decisions as they mature, this is known as conscience. If you can get them in touch with that and comfortable with it, they will make much better choices concerning right and wrong, love and hate, selfishness and unselfishness.
My own children have come to where they know inside of them is something that engravens, so to speak, truth inside them. Whether that truth be about how rain falls, how birds fly, or how to cheer up someone who is sad.
Good luck learning how to juggle this wonderful age where their language and curiosity take flight. This process of association has been going on since conception (this has been researched and proven) and hopefully, if you keep it alive, it will continue through its many stages throughout their whole life.