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You know the following: 
A) 80, 10%
B) 75, 20%
C) 50, 45%
D) 90, 5%
E) X, (100-10-20-45-5)% = 20%
Therefore, create a formula with the facts given and the mean marks must be ...

The lock and key model:

Only substrates of a specific shape that is complementary to the active site of an enzyme can fit into the active site, in a way that is analagous to a key fitting...

Very thin walls result in a short diffusion distance which makes gas exchange particularly favourable.

Lots of branches and sacs result in a large surface area so gas exchange can be maxi...

Exons are coding regions of DNA, and are copied into mRNA and transcribed as proteins.

Introns are non-coding regions of DNA, and are spliced out of pre-mRNA so are not copied into mRNA.<...

A hydrocarbon is a molecule that contains only hydrogen and carbon atoms.

Any two of the follwing properties are suitable answers:

Low boiling points, low viscosities or hig...