1. Bat wing and bird wing
2. Dolphin dorsal fin and fish dorsal fin
3. Human arm and whale fin
4. Horse leg and lizard tail
2. Dolphin dorsal fin and fish dorsal fin
3. Human arm and whale fin
4. Horse leg and lizard tail
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3. Human arm and whale fin.
If you look at the choices all but choice 3. contain animals from different groups (mammals, bird, etc.)
3. Both are mammals. And although this is not a sure fire way to deem if the structures are homologous. It is definitely a great place to start.
Homologous structures mean they share a common ancestor - You can see the resemblance between the bones of the whale fin and human arm - They have the same number of bones, and many have the same shape. Although the sizes and functions differ.
Choices 1, 2 would be examples of Convergent evolution - when 2 unrelated structures evolve to serve the same functional purpose.
Choice 4 is just silly :)
If you look at the choices all but choice 3. contain animals from different groups (mammals, bird, etc.)
3. Both are mammals. And although this is not a sure fire way to deem if the structures are homologous. It is definitely a great place to start.
Homologous structures mean they share a common ancestor - You can see the resemblance between the bones of the whale fin and human arm - They have the same number of bones, and many have the same shape. Although the sizes and functions differ.
Choices 1, 2 would be examples of Convergent evolution - when 2 unrelated structures evolve to serve the same functional purpose.
Choice 4 is just silly :)
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2 because they serve the same purpose and are made of the same composition whereas bats have skin on their wings and birds have feathers. the answer is 2
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http://answers.yahoo.com/question/index;…
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3.