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What are the non-specific defence systems of the body against pathogens?

There are four main non-specific defence systems, all of which are immediate and the same for all pathogens (hence 'non-specific).1) skin: it acts as a primary defence mechanism as the dry, dead cells on the...
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Translate into Spanish - I went to the cinema yesterday and I did not do my homework.

Fui al cine ayer y no hice mis deberes.
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Answered by Emma A. • Spanish tutor
2826 Views

There are 7 blue pens, 4 green pens and 6 red pens in a box. One pen is taken at random from the box. Write down the probability that this pen is blue

First of all you need to work out the total number of pens. 7+4+6=17. How many of these 17 pens are blue? 7. If you pick one pen out of the 17, 7 of them would be blue. To work out the probability, you need ...
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Answered by Tobias H. • Maths tutor
19398 Views

What are the climatic implications of the tri-cellular model of global atmospheric circulation?

The tri-cellular model shows how energy is transferred polewards via three cells of air circulation: the Hadley, Ferrel and Polar cells. The Hadley Cell involves the meeting of the trade winds in the Equator...
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Answered by Taran G. • Geography tutor
17921 Views

What is the central economic problem?

The central economic problem is scarcity which leads to an opportunity cost. In simple words human wants are infinite but resources are finite (having said that we need to distinguish between human wants and...
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