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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Refer to this portion of a dichotomous key for fish identification to answer the question. 1. (a) has a single dorsal fin ® 5 (b) has a double dorsal fin ® 2 2. (a) one fin is spiny, the other is smooth ® 3 (b) one fin is not spiny or smooth ® 4 5. (a) has small fin on back near tail ® 6 (b) has no fin on back near tail ® 7 6. (a) has barbs near the mouth ® catfish (b) does not have barbs near the mouth ® 10 7. (a) tail is asymmetrical ® 8 (b) tail is symmetrical ® 9 10. (a) scales are small ® trout (b) scales are large ® whitefish what is the next step to complete to identify a fish that has a single dorsal fin, no fin on the back near the tail, and no barbs near the mouth? step 2 step 5 step 7 step 10