Petroleum was formed from organisms: (a) living on the land (b) living on the plants (c) living in the sea living on the rocks

• Soln:

Answer is (c) living in the sea

Explanation:

Petroleum was formed from organisms living in the sea. As these organisms died, their bodies settled at the bottom of the sea and got covered with layers of sand and clay. Over millions of years, absence of air, high temperature and high pressure transformed the dead organisms into petroleum and natural gas.