Original sentence: The loss of body hair is also explainable through a lower parasite load and maintained through sexual selection
Edited sentence: The loss of body hair is also explainable through a lower parasite load and maintained through sexual selection  Other criticisms include other water-dwelling mammals that have dense hair, such as otters, beavers and seals, that subcutaneous fat is the result of a sedentary lifestyle rather than aquatic adaptation, that swimming must be learned rather than being an innate reflex, a lack of a waterproof skin (as demonstrated by the "pruning" of the fingertips when submerged for long periods), eyes that are ill-adapted to see underwater, and the adaptation of the mammalian diving reflex being more easily explained as a reaction to hypothermia than underwater swimming