A mutation can occur in DNA too
This is very easy, since the lakes are near a crop field, runoff fertilizers have obviously contaminated the water, and to prevent it : Careful contouring of the land can help prevent this by slowing and spreading the flow of water, giving it time to soak in before it runs downhill. Terraces, swales and buffer zones can be used to keep fertilizer from entering ponds and other waterways. That was from google for a more detailed response.
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Organisms, like bacteria or lichen, that can live on bare rock and form soil are called Pioneer species. In primary succession pioneer species like lichen, algae, bacteria , fungi as well as other abiotic factors like water and wind, start to normalize the habitat. This type of successions begins on rock formations, such as mountains or volcanoes, or in a place with no organisms or soil.
PYRAMID OF NUMBERS- shows the number of each organism at the different trophic levels (feeding levels ie. producers consumers and decomposers) in a food web.
PYRAMID OF BIOMASS- The biomass of the members of the food chain present at any one time.Pyramid of biomass indicates decrease of biomass in each tropical level from base to apex.
