soluble fibre?

none I believe oats (Oatmeal, cheerios) is soluble fiber.

Some parts of faces are be soluble, but some will not be, as the bowel removes water from the faeces, and some soluble things will be removed with this water. Fats and fibre are examples of non soluble parts of faeces.

Yes; the surprising thing is that although many vegetables and meat seem "fibrous" they really don't have a whole lot of fibre--meaning cellulose (insoluble) or pectin (soluble). Meat has no fibre by this definition.

Whole grains have lots of fibre--that really is the main source of fibre although veggies and fruits have small amounts of fibre.

Oatmeal contains fibre and fibre is good for the movement of the bowel causing a laxitive effect which preduces gas.