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Muscle cells are present in the stomach wall so that they can contract and move the food. This aids digestion and the action of enzymes

100=ab

P=2a+2b

P=2a+200/a

dP/da=2-200/a^2

dP/da=0 implies 2=200/a^2

a^2=100

a=-10,10

a is a length so t...

The movement of molecules from an area of high concentration to low concentration across a membrane using energy.

I strongly advise students to follow the PEEL approach.First you write your point, in a relatively short, focused and simple sentence. You proceed to offer the quote from the text that your point relates ...

At the beginning of their course most A-level students fall into the trap of thinking a good evaluation point is one which completely contradicts or negates their previous argument. That is not the case. ...