Biological material may refer to:
Biological tissue, or just tissue
Biomass Biomass

In energy production and industry, biomass refers to living and recently living biological material [i] ... 

, living or dead biological matter, often plants grown as fuel
Biomass Biomass

In energy production and industry, biomass refers to living and recently living biological material [i] ... 

, the total mass of living biological matter
Biomolecule Biomolecule

A biomolecule is a chemical compound [i] that naturally occurs in living organisms. ... 

, a chemical compound that naturally occurs in living organisms