Answer :
The answer is that we can tell very readily whether the colony in the culture plate is from the original culture or environment because the contaminant colony will look very different from the original culture in the plate that is being viewed.
All living and non-living objects that occur spontaneously, that is, unaided, are included in the natural environment or natural world. The Earth or certain regions of the Earth are the most common contexts for the phrase. The interaction of all types of living things, as well as the climate, weather, and natural resources, all have an impact on human survival and economic activity. Various elements that make up the idea of the natural environment include:
Complete ecological units with all the plants, microbes, soil, rocks, atmosphere, and natural phenomena that take place within their bounds, and their nature. These ecological units function as natural systems without the major participation of civilized humans.
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