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Name 3 barriers against infection

Any 3 from. Skin. Mucus -in nose, trachea (cilia waft the mucus into the stomach to be destroyed) . Stomach acid. lysosomes (e.g. in tears and saliva)
JS
Answered by Josephine S. • Biology tutor
2943 Views

How do endothermic and exothermic reactions differ?

Endothermic reactions take in heat from the surroundings, whereas exothermic reactions release heat to the surroundings. Exothermic reactions release heat as the energy released from the bonds being made in ...
ML
4204 Views

For what values of k does the line y=kx-1 have two distinct points of intersection with the circle (x-2)^2+(y-3)^2=2?

sub y=kx-1 into circle equation, get (k^2+1)x^2-(8k+4)x+18=0for 2 distinct solutions need b^2-4ac>0, ie -8k^2+64k-56>0iff k^2-8k+7<0complete the square: intersections of equation in k satisfy(k-4)^2...
CB
Answered by Christopher B. • Maths tutor
6044 Views

How do I form the present conditional tense and when is it used?

To put it simply, we use the conditional tense (le conditionnel) to talk/ speculate about what 'would' happen.It is formed by taking the same stem as the future tense (which in most cases would be the infini...
CB
Answered by Clare B. • French tutor
2757 Views

“Peter sets a good example for Christians.” Do you agree? Give reasons for your answer.

I agree that Peter is a good example for Christians as he was the first disciple called by Jesus and one of Jesus' closest friends. He followed Jesus "immediately" when asked to follow him and left...
OH
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