Question at position 25 Analogous anatomical structures in two different specieshave similar functions.are derived from the same ancestral structure.were formerly useful, but are now useless.have different functions.Clear my selection单项选择题

A

have similar functions.

B

are derived from the same ancestral structure.

C

were formerly useful, but are now useless.

D

have different functions.

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Question at position 2 Ichthyosaur was a large aquatic reptile of the Mesozoic, some 150 million years ago. Fossils show that it had a dorsal fin and a tail just as fish do, even though its closest relatives were four-legged terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish areanalogous.homologous.examples of genetic drift.vestigial.Clear my selection

If similarities between two structures in different organisms reflect independent evolution, these structures are :

The wings of a bat and a bird are examples of

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