What part of the cell does 9 represent? a. cytoplasm b. lysosome c. ribosome d. centrosome

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.

Which of the following structures is a double layer of phospholipids with proteins? a: cytoplasm b: cell membrane c: ribosome d: cell wall

Which of the following was a social cost associated with the development of the internal combustion engine used in most cars? a. people were able to use their horses for new tasks. b. new jobs were created. c. blacksmiths needed to gain new skills to continue working. d. families were able to travel farther more easily.