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What were the social and economic consequences for African Americans in Southern states in the aftermath of the American Civil War?

The social and economic consequences for African Americans in Southern states after the conclusion of the American Civil War in 1865 were varied. On one hand, white plantation (and slave) owners lost their s...
HB
Answered by Harriet B. • History tutor
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Factorise and solve the quadratic equation x^2 + 6x + 8 = 0

Theory Problems like this need to be broken down into steps: i) Factorise, ii) solve and iii) check. The aim of this question is to find values of x which satisfy the quadratic equation, i.e. when we substit...
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Answered by Tutor87306 D. • Maths tutor
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Why is the control of insulin called "negative" feedback? How does it work?

Negative is a slightly confusing term, as it seems to imply that the control is bad, when in reality it is vital to being alive! Negative in this sense is used in a mathematical way, meaning "removing&q...
AP
Answered by Andrew P. • Biology tutor
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Describe the steps that occur in allopatric speciation or geographical speciation.

Before speciation occurs we have a population of individuals of the same species that can freely and successfuly mate with each other. In allopatric speciation a geographical barrier forms (a mountain range ...
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Answered by Arthur A. • Biology tutor
10011 Views

Why is the human heart system described as double circulatory?

The human heart system is described as double circulatory becasue is has two seperate circuits. The first carries blood between the heart and the lungs and is known as the pulmonary circuit and the second ca...
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Answered by Suzannah E. • Biology tutor
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