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Carbon and hydrogen.
The simplest group of organic molecules are the alkanes which have only these 2 elements. Eg methane, CH4.
Biotic factors are living things within an ecosystem; such as plants, animals, and bacteria, while abiotic are non-living components; such as water, soil and atmosphere.
So to answer your question,
Biotic: plants and other prey (animals)
Abiotic: water, soil,
Hope this helps!
With less energy at higher trophic levels, there are usually fewer organisms as well. Organisms tend to be larger in size at higher trophic levels, but their smaller numbers result in less biomass
Population size is the number of individuals in a population. Population density is the average number of individuals per unit of area or volume.
