The diagram below shows some fossils representing transition from non-tetrapod vertebrates (fish) to early tetrapods (such as Ichthyostega)
Toyota
a
Acanthostega
TA
<
Pandoriche
Europeo
Which statement provides the best evidence that Eusthenopteron is an ancestor of Ichthyostega?
O Both species contain DNA and amino acids
The fossils were found in different locations
O The fossils all share homologous structures
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Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.