Is matter the amount of organic matter in an ecosystem?

the amount of matter in something is its mass. the mass is constant everywhere in the universe. Not true: The mass increases when you speed up particles to very high speed. This is relevant for our...

The density will change if the amount of matter in the same volume changes. You can have more matter wihtout changing the density, if the matter occupies more space.

No, The state of matter only affects its' concentration. No matter what state matter is in, it will always have the same mass (assuming it doesn't drip or float away). However, the state of matter...

Usually carbon-based substances derived from living things. Examples include everything we grow and eat, wood, dung and the humus content of soil. Organic matter can be added to soil to make it more...

Organic matter (or organic material) is matter that has come from a once-living organism; is capable of decay, or the product of decay; or is composed of organic compounds. The definition of organic...