using the word bank below, compare homologous and analogous structures.
word bank:
same structure, different function shows common ancestry human arm/cat leg/whale fin
same function different structures seen in organisms not necessarily closely related
butterfly wing/bat wing structures evolved independently
1. which structure shows common ancestry?
2. which structure results from similar selection pressures (pressures put on by the environment)?
3. which structures evolved independently?
4. which structure is still present in organisms today but no longer serves a useful purpose?

Question

using the word bank below, compare homologous and analogous structures.
word bank:
same structure, different function  shows common ancestry  human arm/cat leg/whale fin
same function different structures  seen in organisms not necessarily closely related
butterfly wing/bat wing  structures evolved independently
1. which structure shows common ancestry?
2. which structure results from similar selection pressures (pressures put on by the environment)?
3. which structures evolved independently?
4. which structure is still present in organisms today but no longer serves a useful purpose?

Accepted Answer

### Question 1
# Brief Explanations:
Homologous structures show common ancestry. The human arm, cat leg, whale fin (and also the bird wing in the diagram) have the same basic structure (bone arrangement) but different functions, indicating a common ancestor. So the structure that shows common ancestry is "Human arm/cat leg/whale fin" (and the vertebrate limbs in the diagram).
# Answer:
Human arm/cat leg/whale fin (and the vertebrate limb structures shown, e.g., human, dog, bird, whale limbs)

### Question 2
# Brief Explanations:
Analogous structures result from similar selection pressures (environmental pressures) as they have the same function (e.g., flying) but different structures. The butterfly wing, bat wing, bird wing, pterosaur wing have the same function (flight) but different structures, evolving due to similar environmental pressures for flight. So structures with "Same Function different structures" like butterfly wing/bat wing/bird wing/pterosaur wing.
# Answer:
Butterfly wing/Bat wing/Bird wing/Pterosaur wing (structures with same function, different structures)

### Question 3
# Brief Explanations:
Analogous structures evolve independently. The butterfly wing (insect) and bat wing (mammal), bird wing (bird), pterosaur wing (reptile) have different evolutionary origins but same function, so they evolved independently. The word bank also has "Butterfly wing/Bat wing" and "structures evolved independently" associated.
# Answer:
Butterfly wing/Bat wing (and other analogous wing structures like bird wing, pterosaur wing)

### Question 4
# Brief Explanations:
Vestigial structures are still present but no longer serve a useful purpose. However, from the given word bank and diagram, if we assume (though the diagram doesn't show a vestigial structure directly, but if we consider typical examples, or maybe a typo, but from the word bank, maybe a structure like appendix in humans, but in the given word bank, maybe a mis - match. Wait, the diagram and word bank: maybe a mistake, but if we re - check, the question is about a structure still present but useless. However, the given word bank doesn't have a clear vestigial structure example. But maybe a mis - question. Wait, the original problem's word bank: maybe the user missed, but from the diagram, if we consider, maybe a structure like the human tailbone (not shown), but in the given word bank, there's no direct match. Wait, maybe the question is mis - framed, but if we go by the word bank, maybe a mistake. Alternatively, maybe the question is about vestigial, but the given word bank doesn't have it. But if we assume a typo, and from the options, maybe a structure like a vestigial wing in some organisms, but in the given word bank, no. Wait, maybe the question is incorrect, but if we have to answer, maybe a structure like the human appendix (not in the word bank), but since the word bank doesn't have it, maybe the question is wrong. But if we re - check the problem, maybe the user made a mistake. However, if we consider the given word bank, there's no vestigial structure example. So maybe the question is incorrect, but if we have to answer, we can say that a typical vestigial structure is the human appendix (though not in the word bank), but since the word bank is given, maybe the question is mis - asked.

# Answer:
(No clear answer from the given word bank and diagram for a vestigial structure; typical example: human appendix, but not in the provided word bank. If forced with given word bank, maybe a mistake in the question.)

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