Natural Science CLEP Prep 2025 – 400 Free Practice Questions to Pass the Exam

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What type of organisms form the smallest amount of biomass on Earth?

Plants

Fungi

Bacteria

Bacteria form the smallest amount of biomass on Earth. While they are small in size, bacteria are incredibly abundant and can be found in almost every environment on Earth, including deep in the Earth's crust and in the ocean's depths. Plants and fungi, while important for their roles in the ecosystem, form larger amounts of biomass due to their larger size and ability to photosynthesize. Protozoa, while also small in size, make up a larger portion of the Earth's biomass compared to bacteria. Ultimately, bacteria make up the smallest amount of biomass on Earth due to their small size.

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Protozoa

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