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Atoms of the same element with different numbers of neutrons 

The movement of molecules against their concentration gradient (low concentration to high concentration), across a membrane using energy.

Example solve the following, equation 1: x²+2y=9 equation 2: y=x+3In this example we have to use substitution, therefore we sub in equation 2 into 1 to get the following x²+2(x+3)=9 ...

2^6 = 64 (2x2x2x2x2x2)6^2= 36 (6x6)
64+36= 100
Square root of 100= 10 (10x10=100)

Answering this question, I would start by talking about when I have lunch and by comparing it to people in Italy. It is a good way to show that you know how to say the time in Italian and you know some as...