Answer:
c. all matter has an attractive force that is dependent on its mass
There is variation in DNA.
Answer:
d
Explanation:
measures hydrogen ion concentration
The pH of a solution is a measure of the concentration of hydrogen ions in the solution. A solution with a high number of hydrogen ions is acidic and has a low pH value. A solution with a high number of hydroxide ions is basic and has a high pH value. The pH scale ranges from 0 to 14, with a pH of 7 being neutral.