QUESTION TYPE: Most Strongly Supported
CONCLUSION: We land dwellers have rotating limbs ending in digits (e.g. arms with fingers, legs with toes.)
New evidence shows that an aquatic ancestor of land mammals might have been the first to evolve this trait.
ANALYSIS: We don’t have very much information in this stimulus. The wrong answers all talk about things of which we know nothing.
- Who knows? Maybe the Acanthostega was very successful. Its skeleton was only too feeble for land movement, but the animal may have done just fine in water.
- There’s no evidence for this extreme statement. For example, most fish have spines but so do land animals. Does that mean a spine is a disadvantage for land animals?
- No. The fact that the Acanthostega couldn’t move on land is evidence against this idea.
- We have no clue. We only have information on one aquatic species and we don’t know if the Acanthostega found its limbs to be an advantage or not.
- CORRECT. The anatomical characteristics are the rotating limbs with digits. Some aquatic animals refers to the Acanthostega, which had such limbs.
Those limbs likely present a survival advantage on land because they are useful for land movement and most land animals kept this feature.
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