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What are some of the non-specific, first-line immune defences in humans?

When we think of immune defences, our minds may immediately jump to white blood cells such as macrophages or T lymphocytes, however there are actually many mechanisms by which our bodies fight infection by p...
DA
Answered by Dawid A. • Biology tutor
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How did Adolf Hitler and the Nazi Party consolidate their power by 1934?

This question will probably be worth around 6 marks in the exam depending on what exam board is being sat. A general rule of thumb is that if a question is worth 6 marks then 6 pieces of information will be ...
AG
Answered by Alexander G. • History tutor
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A mass of 2kg is dropped from rest at a height of 10m. i) What is the initial GPE of the mass? ii) What is the final velocity of the mass when it hits the ground?

Part i Gravitational Potential Energy (GPE) = mass x gravitational acceleration constant x heightGPE = 2 x 9.81 x 10 = 196.2J Part ii Conservation of energy states that the sum of the GPE and KE at the intia...
ZS
Answered by Zaakir S. • Physics tutor
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n is an integer greater than 1. Prove algebraically that n^2-2-(n-2)^2 is always an even number

We want to show that this gives an even number, so we need to get it into a form that it is 2 multiplied by some positive integer. We start by expanding the (n-2) 2 out, remember that (n-2) 2 =(n-2)(n-2). Th...
JC
Answered by Jacob C. • Maths tutor
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Assess the arguments in favour of an elected House of Lords

The main arguments in favour of an elected House of Lords are that this would enhance democratic legitimcy in the House of Lords , widen the basis for represention and this could increase checks on governmen...
ED
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