One lesson taught to a boy scouts troop on the hike was that the plants along the trail were adapted to conserve water. suggest two reasons why the plants observed growing along the trail had mechanisms to reduce water loss.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

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

The tubes transporting minerals and water upward are called ?