Osmosis is how water travels
The correct answers are:
d. Although most mammals, including humans, are not able to digest the milk sugar, lactose, after infancy, the ancestors of northern and western Europeans relied on dairy products as an important part of their food supply;
e. When other food sources were in low supply, mutations that allowed the expression of the enzyme lactase to persist past childhood conveyed an advantage to adults who were able to include dairy products in their diet.;
The humans from Northern and Western Europe, unlike the other people, lived in conditions where very often the food sources were scarce. With the domestication of the animals, especially the cows, goats, and sheep, the humans in this regions started to use the milk from these animals in times of crises. Over time their organisms started to become more prone to digesting the milk, thus having less and less problems with the lactose. Also, the people who were able to tolerate the dairy diet were seen as having advantageous traits, thus became more favorable for mating, which gradually increased and made dominant the population that is able to have dairy diet.
Personally I don't hear any but lots of my friends say they do. I obviously just hear silence but if you hear a ringing when there not plugged then I'd visit a doctor :D
I<span>nterfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid.</span>
