1. Some typical adaptation for these animals are lack of pigmentation, reduction in the size of eyes or absence of eyes altogether, development of sensory mechanisms that do not depend on light for detecting food or predators.
2. Oxygen is not plentiful in the caves because photosynthesis does not exist because of the lack of light; as well as low water circulation, yet the creatures still adapt.
3. Adaptations occur because they happen at random events and if there's an advantage the organisms is more likely to survive and reproduce than other organisms
4. This happens because anchialine caves tend to be oxygen depleted because no photosynthesis does not occur.
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