Wood

Lots of compounds.

A mixture, in other words.

Compound.
(With the understanding that compounds are made up of combined elemnts )

an element:
* consists of only one kind of atom,
* cannot be broken down into a simpler type of matter by either physical or chemical means, and
* can exist as either atoms (e.g. argon) or molecules (e.g., nitrogen).

a compound:
* consists of atoms of two or more different elements bound together,
* can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means),
* has properties that are different from its component elements, and
* always contains the same ratio of its component atoms.

Wood is not a compound. It is, as has been said, a mixture of compounds.

Is this a biology question?

It's biology when you've got wood.

Like in a "wood pecker"?

Your mastery of idiom is giving me an erection.

Are you building a tree house ? I know where you can get some wood .