People say somebody shot first but they don't know who
The answer is - b. produce and distribute goods and services
A vase on a table overcomes gravity because of the upwards force of the table against it, which is stronger than the force of gravity. If you were to move the vase off the table it would no longer have anything stopping gravity from breaking it.
Given the reaction after the attack, the reaction Mike gives best indicates that he retains an implicit memory.
The main elements of population change are births, deaths, and migration.