Which of these best explains why birds and dogs both show gills in their early development?
A. Both organisms can breathe underwater.
B. Both organisms share a common ancestor.
C. Both organisms use them to process food when they are young.
D. Both organisms have different ways of forming their lungs.
Answers: 3
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Which of these best explains why birds and dogs both show gills in their early development?
A. Both...
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