When blood volume increases to the point that cardiac cells are stretched, the heart releases what natriuretic hormone?

What is the relation ship between structure and function in an organism

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 environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?