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Surface-dwelling and cave-dwelling tetras may belong to the same species, but they are quite different.
Cave-dwelling tetras can no longer see but use sensory receptors on their skulls to navigate.
Mexican tetras are a fish species with two distinct populations: surface-dwelling tetras and cave-dwelling tetras.
Surface-dwelling tetras can see, whereas cave-dwelling tetras cannot.
therefore,
in fact,
moreover,
though,
In fact,
In other words,
Granted,
As a result,
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