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Explain the process of evolution?

Evolution occurs via a process called natural selection,Natural selection (termed survival of the fittest by Darwin) is where organisms that are better adapted to an environment survive and reproduce. Theref...
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Answered by Stella W. • Biology tutor
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y(x) = x^2(1-x)e^-2x , find y'(x) in the form of g(x)e^-2x where g(x) is a cubic function to be found

For this question, I would first expand the brackets in the given y(x) to form , x^2e^-2x -x^3e^-2x . With this form, I would then differeniate using the chain rule to then obtain the expression that can eas...
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Answered by Arjun B. • Maths tutor
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A rectangle of perimeter 45cm has sides of length x and x+4. Work out the value of x.

First, draw a diagram to help visualise the problem. Next, write out the full sum: x + x + (x+4) + (x+4) = 45 This simplifies to: 2x + 2(x+4) = 45 Which expands to: 2x + 2x + 8 =45 This simplifies to: 4x + 8...
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Answered by Imogen R. • Maths tutor
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Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction (3 marks)

The question is three marks, so should have three points.1) Active site of the enzyme has a specific shape / tertiary structure / complementary to maltose 2) Only maltose can bind / fit3) Forms an enzyme-sub...
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Answered by Amy W. • Biology tutor
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Define an isotope.

Compounds with the same molecular formula but have different structural formulas.
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Answered by Shivani S. • Chemistry tutor
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