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- PBS Eons
How Blood Evolved (Many Times)
(Season 2,
Episode 9)
- TV Episode | 10 min | Documentary
Blood first appeared in the Precambrian period and proteins metal complexes to sequester oxygen appeared as animals grew larger. But different taxonomic groups used different proteins and metals and for different purposes.
Status
Cast | + Add Cast |
| 1 cast member |
| Name | Known for |
|---|---|
Hank Green
Self - Host
|
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