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Microorganisms cause diseases. The human body has many ways of defending itself against microorganisms. Describe two ways the body prevents the entry of microorganisms.

Any two from:acid in the stomach kills pathogens in food/ skin forms a barrier or produces antimicrobial secretions/ hairs in the nose trap pathogens/ trachea or bronchi has mucus which traps pathogens
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Answered by LUKE S. • Biology tutor
3543 Views

Given that 7/9 = 0.77777777 (recurring) convert 0.27777777(recurring) into a fraction. Give your answer in the simplest form.

if 7/9 = 0.777777 then 0.0777777 must be equal to 7/90 as it is a tenth of the original number. 0.2= (2/10)(7/90) + (2/10) = 0.27777777 find the lowest common multiple: 90, then make the denominators of each...
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Answered by Nial K. • Maths tutor
6228 Views

Solve algebraically the simultaneous equations x2 +y2 =25 and y – 3x = 13

Firstly, let's begin by rearranging the second equation so that we can get y on its own. Therefore we will get, y = 3x +13. Through substitution, we can do this:x 2 + (3x +13) 2 = 25 . (As y is equal to 3x +...
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Answered by Tasmin M. • Maths tutor
7468 Views

What's the difference between ser and estar?

Both ser and estar mean ‘to be’ but each has different uses. This can be confusing for native English speakers because in English there is only one word. Ser is used when we want to describe characteristics ...
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Answered by Tasia B. • Spanish tutor
2323 Views

Insert a pair of brackets into this question to make it correct 2 + 5 x -6 = -42

(2+5) x -6 = 42
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Answered by Inumidun O. • Maths tutor
4372 Views