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DNA is the molecule that carries all the instructions to make you, you. All life has DNA. You get your DNA from your parents. However, mutations in DNA can occur, which, together with evolution through natural selection is why life can be so varied.The DNA double helix shape represents the two strands of DNA joined together by theme bases (the ‘rungs’ in the ladder).

Serotonin is a chemical neurons (brain cells) use to communicate. Serotonin is how our brain tells us we are happy. Serotonin is also responsible for regulating mood, appetite and sleep.Low levels of serotonin can cause depression, which is why antidepressants can be used to boost serotonin levels. Many hallucinogenic substances also work via the serotonin pathway.Length: 20mm