Conventionally, the totality of all environmental factors is divided into three large groups – abiotic, biotic and anthropogenic.
Abiotic factors are factors of inanimate nature, primarily climatic ones – sunlight, temperature and humidity. This group of factors includes secondary climatic (local) factors – topography, soil properties, salinity, air and sea currents, wind, radiation, etc., indirectly affecting organisms.
Biotic factors are all kinds of forms of influence of living organisms on each other. In this case, organisms can belong to the same or to different populations. As an example, one can cite such relationships as pollination by flowering plants by insects, eating of some organisms by others, competition between organisms for certain types of vital resources (food, space, light, etc.), parasitism, and much more.
Anthropogenic factors are those forms of human activity that, acting on the environment, change the living conditions of living organisms or directly affect certain types of plants and animals.
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