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Competition and Environmental Change

Organisms compete in their environment for resources to survive and reproduce. Plants and animals
compete for different resources.

Plants compete for water, space, light and minerals.

Animals compete for mates, territory, water and food.

Environmental changes are caused by different factors which we class as either…

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Water Pollution

If the amount of raw sewage increases in a lake/river, the bacterial population will increase and use
up the oxygen. Certain indicator species are very sensitive to the amount of oxygen dissolved in the
water. If you find species such as mayfly larvae it means the water is…


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