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Fill in the blanks.
Most mammals walk on _____ legs to move around on land. Some mammals (including human beings) walk upright on ____ legs.
Marine mammals use _______ to move around in the sea.
Flying mammals use their upper limbs, or ________, to move around.
Most mammals walk on FOUR legs to move around on land. Some mammals (including human beings) walk upright on TWO legs.
Marine mammals use FINS to move around in the sea.
Flying mammals use their upper limbs, which are WINGS to move around.