Circulatory systems — Easy
Recall and familiar applications. Optional hints help you find a first step.
Includes extension practice
The pump, vessels and one-way valves are required. Fish single circulation, mammalian double circulation and its advantages go beyond this course’s listed circulatory-system outcome.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- Cambridge 0653 syllabus2028–2029 · B9.1.1
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