Which is NOT true regarding transport of molecules?

A)

Small, nonpolar molecules diffuse directly across the cell membrane.

B)Large molecules, such as glucose, use membrane proteins to cross the cell

membrane.

C)Osmosis is an active transport process that moves water against the

concentration gradient.

D)

Charged molecules, such as Cat, Na, and K* cannot diffuse directly across

the cell membrane and must use membrane proteins.

What are two ways in which waves erode the land?

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

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above