Duncle

Yes, I agree. We do have a large set of traits that appear to be adaptions to an aquatic environment. On the other hand, we don't have the capacity to hold our breath underwater for very long. Aquatic mammals such as sea lions and whales have high levels of myoglobin in their muscle tissue, which allows them to store large amounts of oxygen, and therefore remain underwater for prolonged periods. This adaptation has obviously evolved multiple times. The fact that we aren't adapted in this way perhaps points towards a weak version of the AAH.