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According to Darwin's theory, genetic variation within the population means that some elephants are born with longer noses. Longer noses are better suited to the environment, so longer-nosed elephants are...

A homologous series is a group of compounds that share the same functionl group. Members of the same series have similar chemical properties and show a gradation in physical properties. E...

Mutation, meiosis and sexual reproduction causes variation amoung members of the same species. Species tend to produce more offspring than the environment can support leading to competition for food or pr...

Firstly we have to factorize the quadratic. We do this by finding two numbers that multiply to -12 and add to 1.Looking at the factors of 12 we can see that x²+x-12= (x-3)(x+4)because -3 x 4 = ...

If we want to make y the subject of our equation, we need to re-arrange our equation so that y is on its own on one side of the equation. Such as y=...To re-arrange our equation, we need to decide if we w...