Bovine veterinarians i believe
The scientific method happens in our daily lives whether we know it or not. You’ve probably heard of this example before, but a light bulb that burns out may simply need to be replaced. A light bulb that works intermittently is a much more suitable candidate for use of the scientific method, because of all of the potential causes of it not working.
I'd say create a compost bin. Hopefully this was what you were looking for.
Fungi contain cell walls made of chitin.