You probably know that people have different blood types, and that not everybody can receive blood donations from everybody else. If you've got type A, you can donate to A or AB, and if you've got type O you can donate to anyone—but only receive from other type O donors. But why? And what do blood types even mean? Watch the video below to learn more.
Why We Have Different Blood Types
Why Doesn't Everyone Have The Same Type Of Blood?
Blood: A Crash Course
Written by Curiosity Staff April 27, 2017
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