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Describe and explain how the human lungs are adapted for efficient gas exchange (3 marks)

There are millions of alveoli (gas exchange surface), so they have a very large surface area collectively, which is further increased by having a folded membrane. A larger surface areas means there is a fast...
Answered by • Biology tutor
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how would you describe the structure of the small intestine in relation to its function?

the small intestines function is for the reabsorption of nutrients into the blood. The small intestine has multiple structural adaptations in relation to its function, primarily the mucosa which is a layer c...
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Answered by rosie M. • Biology tutor
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In a stack of CDs, there are 3 types: Rock, Pop and Jazz. There are 2 Rock CDs, x Pop CDs, and (2x+5) Jazz CDs. A CD is chosen at random. If the probability it is Rock is 1/20, work out the probability it is Jazz.

Number of Rock CDs = 2Total Number of CDs = 2 + x + (2x+5) = 3x + 7Probability of Rock CD = 2/(3x + 7) = 1/202/(3x + 7) = 1/2040 = 3x + 7x = 11Number of Jazz CDs = 2x + 5 = 27Total Number of CDs = 3x + 7 = 4...
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Answered by Vinh L. • Maths tutor
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How accurate is it to say that Stalin’s use of terror in the 1930s was fundamentally similar to Lenin’s use of terror in the years 1918–24?

This question is fundamentally asking a question of continuity, it is asking whether the use of regime terror during Stalin's authority was essentially a continuity of the use of terror during Lenin's reign....
Answered by • History tutor
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What are the main differences in composition of blood taken from an artery to blood taken from a vein?

An artery which principally supplies cells metabolism would contain more of the 'fuels' required such as oxygen and glucose. A vein typically carries blood containing the waste products of metabolism and the...
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Answered by Tegen W. • Biology tutor
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