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Animal and plant cells share many similarities. For example, they both have: a nucleus, which houses the genetic material; a cytoplasm, where the chemical reactions of the cell occur; a cell membrane, whi...

x² + 4x + 3 is a quadratic equation. We're looking for a pair of numbers that add to make 4, and multiply together to make 3. Students should be encouraged to try options (e.g. 2 and 2).
T...

An ad valorem sales tax is a percentage tax on the market price of good, normally paid for by the seller. This tax will pull the supply curve up towards the top left corner of a supply and demand curve, w...

One consequence was that families that had been separated could meet each other again. This was because after the construction of the Berlin Wall in 1961 the East and West of Berlin were separated by the ...

Diffusion is the passive (does not require energy input) movement of a substance down a concentration gradient from an area of high concentration to an a...