fish amphibian reptile
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Embryos of different chordate species resemble each other at an early developmental stage. They then become increasingly different from each other as development proceeds. What does this indicate? A. Embryogenesis recapitulates evolution; B. Chordates do not have a common ancestor; C. The general structural features of chordates emerge before species-specific features; D. The chordate phylum evolved more recently than the non-chordates.
Studying the embryology of animals provides important evidence to support claims of shared evolutionary history. What feature of embryology makes it capable of providing data for common evolutionary history not readily available from other sources? A)As the embryo develops, it reveals the expression of genes. B)The growth of the embryo is achieved by differentiation of cells. C)A developing embryo exhibits structures not present in the adult animal. D)The development of embryos of a certain species is consistent.
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When systematists study morphological or behavioral traits to reconstruct the evolutionary history of a group of animals, they assume that: a. underlying genetic similarities and differences. b. $\quad$ the animals use exactly the same traits to identify appropriate mates. c. differences in these traits caused speciation in the past. d. the adaptive value of these traits can be explained. e. $\quad$ variations in these traits are produced by environmental effects during development.
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