Q: Biomass is the mass of biological what?


Read this paragraph and choose the correct option from the provided answers:

Biomass is the mass of biological organisms. It is usually used to describe the amount of organic matter in a trophic level of an ecosystem. Biomass production involves using organic matter ("biomass") from plants to create electricity. Using corn to make ethanol fuel is an example of biomass generated energy. Biomass is generally renewable.

 Choices:

- tissues

- proteins

- lipids

- organisms


A:
organisms