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What conditions are needed for evolution by natural selection to arise?

Evolution by natural selection arises when these three properties are present in a system Heredity - offspring resemble their parents in discrete characteristics. Variation - there are heritable differences ...
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Answered by Richard A. • Biology tutor
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Explain the reflex arc using an example in humans

The reflex arc describes a sequence of events leading to an action that takes place rapidly in response to a stimulus without having to think about it i.e. without an impulse travelling to the brain for coor...
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Answered by Shayaan A. • Biology tutor
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(5 + 2(2^0.5))(7 - 3(2^0.5))

23 - 2 0.5
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Answered by Naman W. • Maths tutor
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What is a synpase and what is the function of synpases?

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Answered by Joseph P. • Biology tutor
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Differentiate arctan of x with respect to x.

Say arctan of x is equal to a value y. Now take the tangent of both sides; x now equals tan of y! Easy from here, differentiate both sides wrt x. Now 1 equals sec^2y dy/dx, and you can rearrange to find dy/d...
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