In adults, blood is formed in short, flat bones like the ribs and sternum. This week's viewer question comes from Monica 
Bustos in Colombia.

In adults, blood is formed in short, flat bones like the ribs and sternum. This week's viewer question comes from Monica Bustos in Colombia.

What is your blood made of? Where is it formed?

Dive in to the fascinating world of science with Tomorrow Today. Your weekly dose of science knowledge. A show for everyone who's curious -- about our cosmos and how it works.

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What is your blood made of? Where is it formed?

What is your blood made of? Where is it formed?