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On an H-R diagram, a protostar would be:
Biomass
The total mass of organisms in a given area or volume, an important energy source and ecological metric for understanding ecosystems.
Biogeochemical Cycle
A nutrient moves among environmental reservoirs and into and out of food webs.
Earth's Sediments
Particles of organic or inorganic material that have been transported and deposited by wind, water, or ice, forming layers on the Earth's surface.
Biological Components
Essential elements, structures, or molecules that are part of or necessary for the living organisms' life cycles and processes.
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