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where does gas exchange occur in the lungs

gas exchange occurs in the alveolus of the lungs. Alveoli provide a good surface for gas exchange to take place.They provide a large surface area to volume ratio which increases the amount of gas that can be...
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Answered by Amelia G. • Biology tutor
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What is eutrophication and how could it negatively impact plant life in rivers?

Eutrophication is the process whereby excess fertiliser is added to fields by farmers. This fertiliser contaisn nitrates which are very sioluble and so easily runs off into rivers and lakes. Plants use nitra...
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Answered by Rose H. • Biology tutor
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Solve 56x + 10 = 60 - 48x

The question is asking us to "solve" the equation which means we need to find the missing variable. In this case, x is our missing variable so our goal is to get all the x's on the same side of the...
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Answered by Lucy O. • Maths tutor
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Define osmosis

Osmosis is the free movement of water molecules across a partially permament member from high water potential to low water potential, down the water potential gradient, without the input of energy.
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Answered by Rose H. • Biology tutor
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Without expanding any brackets, work out the solutions of 9(x+3)^2 = 4

To solve for x first divide both sides by 9, giving the equation:(x+3) 2 = 4/9Then square root both sides, leading to:x+3 = +/- 2/3Finally subtract 3 from both sides leaving:x = -11/3 or x = -7/3
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Answered by Modestas T. • Maths tutor
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