Do Animals Have Blood Groups?

Where does water come from and what would happen if dinosaurs hadn't been wiped out?...
13 November 2015

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Where does water come from, what would have happened if the dinosaurs hadn't been wiped out, does rheumatoid arthritis ever go away, do animals have blood groups, how to stop water from getting contaminated, can the ozone regenerate and why do mosquitos like humans?

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