Cellulose.
The LIVER makes a new substance for the body The LIVER makes a new substance for the body The LIVERmakes a new substance for the body
It makes casein ,a type of rock or hard like substance
One way for a fire to burn at a different temperature is it's wood soft wood such as pine burn fast and hot but hard wood such as muscle wood burns slower and cooler but still hot enough to burn you so don't touch it
Wood is a material (substance) not a chemical compound (it is not a pure substance made of one compound) and surely it is not a change at all, neither chemical nor physical.
Glass
The substance which makes plants woody is lignin. The wood part of plants ( bark in trees ) is made entirely of xylem which is the transport vessel that carries water from the roots to the leaves. Since wood is made of lignified xylem which is very hard, it makes it woody and hard.
Calcium and phosphorus
Wood is a hard substance, composing of the stem of branches of a tree of shrub. Lumber is wood- which has been conditioned
Calcium carbonate
the hard fibrous material that forms the main substance of the trunk or branches of a tree or shrub
It is a hard wood.
Chitin
exoskeleton
Keratin... it's a natural substance that makes the nail harden.
It is a hard wood.
A substance is the essence of any object, so all wood or anything made from it is a 'substance'.
oak is a very hard wood