Answer:
What can be measured but not seen?
I am black when I am clean and white when I am dirty?
How can you burn an apple, blueberry, rose and pumpkin without leaving any ashes but retaining the smell of it?
I can move even when you are still. I can be one or many.
A reaction to being spooked that takes its name from waterfowl
The warmer I am the fresher I am.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?