<span>ecosystems
</span>An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system. <span> </span>
More than two alleles is multiple alleles
<span>The principle that states that two different species cannot occupy the same niche in a given habitat is called principle of competitive exclusion.
It is also called as Gauses's principle or Grinnell's axiom (after G.F Gause, a soviet biologist and J. Grinnell, an american naturalist, who first clearly established it).
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