Biology
Human defences practice
Infection and Response training and original diagnostic questions for Paper 1.
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Human defences practice
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Make it concrete
Analogy
Human defences is like a living system solving a small survival problem: each part has a job, and the answer depends on how those jobs connect.
Why now: An analogy helps when the definition feels abstract.
Do this: Match each part of the analogy to the science idea.
Why it matters
Real-world use
Human defences helps explain health, ecosystems, medicine and how organisms stay alive. Example: A specific antibody binds to a matching antigen on a pathogen.
Why now: Real examples make the mark-scheme words easier to remember.
Do this: Connect one key word to the example.
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