Separate the innate layers from the two arms of acquired immunity, place any example in the active/passive by natural/artificial grid, and read the five antibody classes and the primary versus secondary response.
Unit 6 carries 4 of the 40 zoology marks; with three chapters sharing them, immunity averages between one and two (MEC publishes weights by unit, not by chapter). The MEC scope line: Innate and acquired immunity; Antigens and antibodies. Three ways it is asked:
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See the plansZoology Rapid Revision — Numbers, Ratios & Sequences
Human physiology values, genetic ratios, hormone-to-gland maps and the classification characters MECEE-BL tests — the recall layer of the 40-mark Zoology block.
Human Physiology: The Highest-Yield Zoology Facts
The most repeated human-biology facts — hormones, blood, nerves, vitamins — condensed for rapid revision.
Classification of the Animal Kingdom
Phylum-by-phylum diagnostic features from Porifera to Chordata, with examples.
Origin of Life: From Hot Dilute Soup to the First Amino Acids
How Oparin and Haldane argued life was built up chemically on a young Earth, and how Miller and Urey tested that idea with four gases and a spark in 1953.