If cave salamander didn’t evolve from sighted ancestors, it eyes would be a vestigial structure.
Cave salamanders live in the zone, with complete lack of light (dark zone), so this organisms adapted to that environment with blindness. It is believed that cave salamanders evolved from the ones that could see. The explanation of why they lost their sight is that they conserved energy needed to maintain sight to be more successful in reproduction.
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send a pic for reference pls.
I’m pretty sure it’s the second one and the fourth one !
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by comparing external features, behaviors, or physiology of organisms that enhance their survival such as migration, hibernation, or storage of food in a bulb.
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Layer A is the crust and Layer B is the mantle.
