Which of the following best explains how substances
are transported across the cell membrane?
Choose 1
©
Carbohydrates freely move across the cell membrane.
®
lons freely move across the cell membrane.
Nonpolar gases move across the cell membrane
through embedded transport proteins.
Hydrophilic amino acids move across the cell
membrane through embedded transport proteins.

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. label the following topographic map. click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (increments for contour lines is 50 ft).

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird