The chordate characters, what happens to the notochord in the three subphyla, and the seven vertebrate classes compared on skin, heart, temperature and reproduction.
Unit 2 carries 4 of the 40 Zoology marks on a single chapter whose MEC scope line reads "Diagnostic features and classification from Protozoa to Chordata." About one question a year lands on the chordate end of that line, and it is usually one of these:
The companion note Non-chordate phyla covers Protozoa to Hemichordata with the same yardsticks. This note takes the chordates subphylum by subphylum and class by class.
Upgrade to unlock this and every premium study note, formula sheet and high-yield summary — plus unlimited mocks and full solutions.
See the plansClassification of the Animal Kingdom
Phylum-by-phylum diagnostic features from Porifera to Chordata, with examples.
Diagnostic features and classification: non-chordate phyla
Level of organisation, symmetry, germ layers, coelom, one diagnostic feature and named genera for every phylum from Protozoa to Hemichordata, with the first-to-show table.
Animal Diversity and Classification: Unit Map and Reading Order
What the classification unit covers, how many questions it carries, and how its two notes divide the animal kingdom.
Zoology 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.