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Think about what carbon is used for, and also what plants are required for.
Plants take in carbon dioxide from their surroundings, which enables them to undergo photosynthesis. At night, plants respi...

They travel at the same speed through air.They travel at the same speed through a vacuum.They are both transverse waves.
Other answers that are accepted: they can be reflected, refracted, diffracted,...

An acid is a substance which releases hydrogen ions (protons) when added to water. pH values of less than 7 are considered acidic, with 1 indicating it is a strong acid.

Ensure that your answer is precise, without too much waffle - this can confuse examiners and you'll lose easy marks! Take it step by step:
First, the neurotransmitter, acety...