Nitrogen makes up how much of Earth’s atmosphere? A. 100%

B. 78%

C. 22%

D. 0%

Often, caries will develop in an area of the tooth that's not readily accessible. which cavity preparation form defines this? a. retention b. resistance c. outline d. convenience

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

What are the student's observations and inferences before he starts his investigation?