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What specialised structures do the lungs have to allow diffusion of gases?

The lungs are highly specialised. They have alveoli which are small air sacs. Alveoli give the lungs a big surface area, meaning that more oxygen can diffuse from the lungs into the blood stream, and more wa...
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Answered by Bethany H. • Biology tutor
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What is the subjunctive and when should I use it?

The subjunctive is what we call a 'mood', which is a verb form conveying the attitude of the speaker. By now, you'll be used to employing the indicative mood, which we use to convey facts or statements the s...
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Answered by Rowan A. • French tutor
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Psychologists carry out research into the effectiveness of SSRIS in treating depression. A possible ethical issue which may arise during the study is protection of participants from harm. How could the psychologist deal with this issue? - 4 marks

Participants must be reminded before throughout and after the study that they have the right to withdraw their data from the findings if they are showing signs of distress. (2) When pubishing socially sensit...
DC
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Define osmosis

Osmosis is the movement of water from an area of high concentration to an area of low concentration until an equilibrium is reached. It occurs in cells in the body.
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Answered by Elizabeth N. • Science tutor
3498 Views

Explian how aversion therapy can be used to treat unwanted behaviour such as smoking

Aversion therapy is where an unpleasant event accompanies the behavior that needs to be changed, so that the individual associates this behaviour with the behaviour and no longer does it. In the case of smok...
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