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This is a typical A-level Spanish question which requires the candidate to use the past tense.

An antibody is a chemical released during an infection by lymphocytes that attach to specific antigens.

This is a typical A Level or Pre-U style Spanish discursive writing or oral question which requires the candidate to respond using a range of tenses and sophisticated vocabulary to talk about things relev...

This question is an acid calculation question so it requires you to recall key formulas relating to weak acids. As the Ka of HCOOH has been given, I would start by writing an expression for Ka. Ka= [HCOO-...

Many alveoli which provide a large surface area for rapid diffusion. The walls of the capillaries are only one cell thick which provides a short diffusion pathway, allowing rapid diffusion. Blood circulat...