Cambridge Primary (1-6). Stage 6. Science. Learner's Book - Unit 1: The human body - Question 101

Find out who was the first person to do each of the following and when:
- transplanted the first human heart
- discovered that humans can have different blood types
- invented the first stethoscope to listen to the heart beating
- discovered that a substance in the blood called haemoglobin carries oxygen.

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