A sentence has been given in Active/Passive Voice. Out of the four given alternatives, select the one which best expresses the same sentence in Passive/Active Voice.
Primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region. Primary succession occurs in regions characterized by the absence of soil and living organisms.
Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.