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A stem cell is an undifferentiated cell, that has the potential to become a specialised cell.

What is most important when answering an essay question like this is an exam is planning. You need to make sure that you cover as many points as possible - but more importantly, that you cover them in det...

First, let's talk about the components of water. Water molecules are made of two hydrogen and one oxygen atom bonded together covalently, like many other molecules. However, water is extremely special bec...

Generally, molecules are coloured as they absorb visible frequencies of light, to promote an electron to a higher energy level, so the other (complementary) frequencies of light pass through the sample an...

We can split this power into two bits - the negative sign and the fraction.

Let's deal with the negative sign first and forget about the fraction.

So a negative always means '1 over', or the...