Which gas is responsible for the greenhouse effect? a. Oxygen b. Nitrogen c. Carbon dioxide d. Hydrogen What is the chemical symbol for water? a. W b. H2O c. O2 d. CO2 Which vitamin is also known as the “sunshine vitamin”? a. Vitamin A b. Vitamin C c. Vitamin D d. Vitamin […]
A. Who has been created this mess B. By whom has this mess been created C. By whom is this mess being created D. By whom this mess is being created Correct Answer: C