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Describe how fertiliser run-off can cause damage to a lake's ecosystem.

Fertilisers are generally high in nitrogen, to replenish the nitrogen in the soil assimilated by the crop plants. When this is drained into lakes in run-off, it can cause dramatic consequences. Nitrogen avai...
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Answered by William D. • Biology tutor
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What is natural selection?

Within a population of a species there is great geetic variation giving rise to variation in their phentoypes. Some phenotypes enable an organism to be better adapted to its environment than other members of...
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Answered by Sabrina A. • Biology tutor
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What is the difference between sexual reproduction and asexual reproduction?

Sexual reproduction involves the fusing of 2 gametes (male and female). This results in a variety of offspring as the genetic information is mixed. Asexual reproduction requires only1 parent. Offspring are a...
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Answered by Catherine T. • Biology tutor
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What is an antibiotic and how does it work?

Antibiotics are drugs prescribed to people to fight bacterial infections. They work in the body to target specific bacteria that are circulating or found withing tissues, but cannot work within cells (for ex...
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Answered by Catherine T. • Biology tutor
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What is a test cross (Genetics)?

In genetics, sometimes it is not easy to tell if an organism is heterozygous (having two different alleles of a gene) for a certain trait or if it is a homozygous (having the same identical alleles of a gene...
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Answered by Alisa H. • Biology tutor
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