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Home Q & A Board Biology-Related Homework Help Zoology and Botany (Moderator: ehd123)
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Blacknijapowerr Blacknijapowerr
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6 years ago
A significant change in vertebrate hearts began when
 a. the ancestors of whales returned to the oceans.
  b. flight evolved in birds.
  c. reptiles moved onto land.
  d. air-breathing fish evolved.
  e. amphibians transitioned to life on land and in water.
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Nahsai_qdNahsai_qd
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6 years ago
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