The photograph shows an alarm clock ringing. What is the medium for the sound waves?
O A. Air
O B. Rocks
O C. Water
D. Ears

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen