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Describe ways in which the body prevents entry of microorganisms

The first line of defence is the skin. This forms a physical barrier that prevents any microorganisms from getting into the body. Acid in the stomach, due to the low pH, is another defence the body has. This...
AC
Answered by Adrian C. • Biology tutor
18194 Views

How should I start writing my Personal Statement?

You should first think of how you discovered your passion for the degree you are applying to. Then, you should convince the university that you have all the skills and knowledge required, and most important,...
MZ
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Solve the simultaneous equations: (1) y – 2x – 4 = 0 , (2) 4x^2 + y^2 + 20x = 0

Rearrange (1): y=2x+4 Subsitute this into (2): 4x 2 +(2x+4) 2 +20x=0 Simplify and collect like terms: 8x 2 +36x+16=0 Factorise: (2x+1)(x+4)=0 Therefore: 2x+1=0 -> x=-0.5 and x+4=0 -> x=-4 Substitute th...
AT
Answered by Anastasia T. • Maths tutor
4484 Views

How does this person describe his experience? "Durante los Juegos Olímpicos del 2012 los turistas gastaron dinero en la capital. Esto ayudó la economía de Inglaterra y me alegró mucho."

This question is taken from a 2016 GCSE past paper. In language exams there are lots of reading comprehension questions. For this question in an exam, there would be lots of different people's viewpoints and...
RL
Answered by Rosanna L. • Spanish tutor
2342 Views

Why does Magnesium Oxide have a higher melting point than Sodium Chloride?

Both Magnesium Oxide and Sodium Chloride exist as a giant ionic lattices where each oppositely charged ion is held in place by a strong electrostatic attractions. These ionic bonds are strong and require a l...
JC
Answered by James C. • Chemistry tutor
94298 Views