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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
18265 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
2387 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
95085 Views

Use examples to explain how sustainable schemes can be used to manage transport in urban areas

Sustainable transport can be defined as transport which meets the need of the present without compromising the needs of future generations. It must be both environmentally and financially sustainable, utilis...
JC
Answered by James C. • Geography tutor
6709 Views

What properties makes an object stable?

An object will be stable if the centre of mass, the point at which all of the mass of the object is concentrated, is lower to the ground. It will also be stable if there is a wide base. Objects with low cent...
EA
Answered by Edward A. • Physics tutor
13979 Views