Geologists have found Earth’s history is marked by several major events. What does the fossil record show took place around the same time Pangaea formed?A. single-celled organisms evolvedB. explosion of new life formsC. mass extinctionD. first animals lived on land

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present