Blood

Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells of the body, and transports metabolic waste products away from those same cells.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

IDITOL

The science of molecules — organic chemistry, biochemistry and chemical engineering, explained, with the calculators every chemist needs.

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Every species, image, fact, and figure is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.