What happens when a mechanical wave travels through a medium

waves are transferred.

mass is transferred.

energy is transferred.

particles are transferred.
hurry this is a timed unit test

What do science, technology, and disease have to do with each other?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

What causes darkening of the skin as melanin production increases