THE main cause of water pollution are fertilizers and nutrient pollution<span>. Some of the pollutants that are most prevalent in the manure, sewage and chemical fertilizers are Nitrates and phosphates. These pollutants run into the streams and rivers causing excessive growth in aquatic plants and algae leading to clogged waterways and dead zones.
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<span>As people who are living in the same planet, it is important that we interact with one another and build a strong relationship because no one lives entirely independently of the others. From the choices, the obstacle in developing good relations is (b) people fear of taking risks. </span>
If there not then people will then think ur racist/don’t understand the differences between the self and people from other countries
One thing that prevents communicable diseases is Vaccination programs.
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Normally a sperm can easily penetrate the egg, but if another sperm has already entered, or the sperm and/or egg is defective. Ignore the other answer because it merely restates your question. So a sperm can always penetrate an egg unless it is too late or either it or the egg is defected.
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