Answer:
cell wall hope this will help
my sis just took the test the answer is
B.) An atom is solid material.
or An atom is a solid sphere.
It occurs as detrital grains in sedimentary rocks. It forms under extreme pressure.
Food causes the response (salivation). Pair the food each time with a cell phone ringing. Continue this process with repetition.
• Eventually, the rabbit will learn to salivate at the ringing
