Top answers

What does the nervous system consist of and what does it do?

Your nervous system is divided into two parts: - The central nervous system (CNS) which is made up of the brain and the s pinal cord. - The peripheral nervous system is all the other nerve fibres that connec...
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Answered by Appitha A. • Biology tutor
7651 Views

Why are drug trials needed?

To determine the side effects of taking the drug on humans, to test for toxicity, to determine the correct dosage needed, and to test the effectiveness (efficacy) of the drug.
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Answered by Devna P. • Biology tutor
3891 Views

What is the difference between a recessive and dominant allele?

Alleles are different versions of a gene . Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele for brown eyes or a...
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Answered by Elisha J. • Biology tutor
14397 Views

How could species have evolved from an ancestor such as Archaeopteryx?

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are produ...
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Answered by Heather J. • Biology tutor
8869 Views

What is Eutrophication? What are the stages of Eutrophication?

Eutrophication is the loss of oxygen in a body of water (e.g. pond or lake). This is usually due to algal bloom caused by artificial fertilisers and other chemicals being washed into the water by rain.The 5 ...
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Answered by Charlotte G. • Biology tutor
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