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Biology 18 Online
OpenStudy (anonymous):

One adaptation that is unique to marine mammals is they a)produce milk and nurse their young b) bear live young c)nurse their young d)they have more blood proportional to their body size

OpenStudy (dan815):

They have more blood proportional to their body size than land mammals, as they need to store more oxygen in their blood, to stay under water for longer periods.

OpenStudy (nincompoop):

https://youtu.be/2uhhVwYfllE?t=7m48s

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