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12 October, 17:44

Which of these are common to all mammals?

A: type of reproductive system, brain size, skin

B: digestive system, heart lungs

C: digestive system, number of toes, blood

D: kidneys, liver, skeletal structure

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Answers (1)
  1. 12 October, 18:06
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    The answer is D kidneys liver skeletal structure
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