What makes eukaryotic cells more complex than prokaryotic cells? A. the presence of the plasma membrane
B. the presence of membrane-bound organelles
C. the presence of nucleic acids
D. the presence of ribosomes

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.

When animals eat, the food is stored and digested in the stomach or a similar structure. but when a unicellular organism like this paramecium eats, the food is stored in which organelle