The evolution of which of the following features of mammals is hardest to trace through the fossil record? a. Jaw structure b. Mammary glands c. Middle ear structure d. Development of hair
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This provided a survival advantage to ancestral species as the glands provided nourishment. Show more…
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Which of the following is true of mammals? (a) all have placentas (b) evolved from saurischian dinosaurs (c) three middle-ear bones (d) most are ovoviviparous (e) evolved during the Devonian period.
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