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Firstly, it's really important to have a good level of familarity with the text, as this can help you choose what to write about in the exam. Make sure you have read the full text at least twice - preferably...

equation 1) x - 2y = 1equation 2) x 2 + y 2 = 13 Rearrange equation 1 to: x = 1+2ysubstitute into equation 2: (1+2y) 2 + y 2 =13expand first bracket: (1+2y)(1+2y) +y 2 =13(1+4y+4y 2 ) +y 2 = 13Collect like t...

Equation 1) y=3x+4Equation 2) y=x+1 Rearrange equation 2 into terms of x as this is the simplest: x= y-1 (We do this by subtracting 1 off of each side to get X by itself)Substitute new equation 2 into 1: y=3...

Darwin's Theory suggests that all populations have variation between them, this variation is primarily caused by mutations in DNA. If an individual within a species gains a beneficial mutation it will be mor...

The nature vs nurture debate is about whether behaviour is caused by our genetics or whether all behaviour is learnt. Genetics refers to our DNA; what we are born with which is determined by our parents' DNA...