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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

Answered by LUKE S. • Biology tutor

2936 Views

Solve the inequality x^2 - 9 > 0

This is a quadratic inequality, because we have an x² term, so we answer this question by examining the graph of the associated equation y = x² - 9, and then find out where this grap...

Answered by Rose H. • Maths tutor

15512 Views

For my oral exam in French, how do I put forward my ideas concisely?

When looking at the topic and the question in the card you will receive 5 minutes beforehand, think about everything you know on the subject and select peculiarities or the most relevant issues that you ...

Answered by Morgane S. • French tutor

1568 Views

Steve, a novice gardener, plants sunflower seeds into small pots. He does not water them and is upset that they have not grown a week later. Explain why water is needed for the germination of a seed and what other conditions are required also and why

Preparation: This is a complex question requiring several strands of knowledge. It is best to break down the question into smaller chunks and answer each of those, to gain maximum marks. ...

Answered by Simran D. • Biology tutor

1587 Views

Outline the effects of a lump-sum tax on companies selling cigarettes and who ends up bearing the burden of the tax. You should assume that there was previously no taxation in this market.

A lump sum tax is a specific tax, it is a fixed amount charged to producers which can then be offset onto consumers. It is characterised as being the same amount of tax charged across all income levels, f...

Answered by Xena V. • Economics tutor

3773 Views