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Describe How Speciation Occurs Through Sympatric/Allopatric Speciation and What Are the Differences Between the Methods?

The main difference to consider would be that sympatric speciation occurs in the same habitat and population while allopatric speciation requires a geographical barrier between subsets of the population. In ...
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Answered by Rana E. • Biology tutor
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What is a tone row?

A tone row is a series of notes in a fixed order, like a melody or riff but with no rhythmic values assigned to the pitches. Most commonly it contains all 12 tones of the chromatic scale just once, such as i...
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Answered by Leo T. • Music tutor
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Describe the cardiac cycle, referring to the valves of the heart.

Deoxygenated blood enters the right atrium of the heart via the superior & inferior vena cavae. The atria contract and the right atrioventricular valve opens, allowing the blood to enter the right ventri...
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Answered by Thomas R. • Biology tutor
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Outline 2 cultural factors that may affect ethnic differences in educational achievement (4 marks)

One factor highlighted by Beretier and Engelmann is differing speech codes. They note that poor black families tend to use 'ungrammatical', broken English, putting them at a disadvantage in achieving educati...
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Answered by Sophie M. • Sociology tutor
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Briefly explain how both social and environmental considerations are important in sustainable development (6 marks)

Sustainable development is defined by the Bruntland Report as development which meets the needs of future generations without compromising the ability of future generations to meet their needs. For this to b...
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Answered by Sophie M. • Geography tutor
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