Answer:
A. fossils.
Explanation:
He compared fossils from each continent and realized that they have similar characteristics.
Hope it helps.
Answer:
Explanation:
Acid. is a substance that increases the hydrogen ion concentration in a solution.(hight H+ concentrations) ~When hydrochloric acid is added to water, hydrogen ions dissociate from chloride ions: HCl -> H+ + Cl− ~Addition of an acid makes a solution more acidic.
C!! i had this question before . energy decreases at top