Question

Which of the following is a pure substance?
Air
Blood
Copper
Wood​

Answer 1

The answer is "Copper" or option C. Air, and blood aren't pure substances but mixtures, wood is also a mixture which means the answer is copper. Pure Substances are is matter with composition and distinct chemical properties.

Hope this helps.

Answer 2

copper

Step-by-step explanation:

its an element, its not mixed with anything else