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Megapode birds open and close the air vents of the nest at different times of the day. Suggest reasons why it is necessary to open and close the air vents.

There are a number of reasons why it is necessary to open and close the air vents. These include; allowing oxygen in, which is also necessary for respiration and allowing heat to escape. Closing the air vent...
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Answered by Davina R. • Biology tutor
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y is proportional to x^2. When y is 75, x is 5. Find a formula for y in terms of x

y is proportional to x 2 so this means y = A*x 2 for some constant A. When y = 75, x = 5. Put these values in the formula above to find A: 75 = A*25 75/25 = A A = 3 So y = 3x 2
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Answered by Thomas M. • Maths tutor
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What is diffusion?

For the exams, the definition you will need to know is that "diffusion is the net movement of a substance from an area of high concentration to an area of low concentration, down a diffusion gradient&qu...
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Answered by Emily R. • Biology tutor
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What are methods of promotion?

There are six main methods of promotion that businesses can use. The first method is advertising, which is above-the-line promotion, and involves any form of advertising such as TV or radio adverts, billboar...
CP
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What is the relative formula mass of sodium chloride?

58.5 Relative formula mass (M r ) is found by adding together the relative atomic masses (A r ) of all the atoms present in a compound. Sodium Chloride is NaCl. The relative atomic masses can be found in the...
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Answered by Jenny S. • Chemistry tutor
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