The correct answer is (c) ozone and oxygen.
Explanation:
Oxygen (O2):
This is the most common form of oxygen in the atmosphere, making up about 21% of the air we breathe. It is a diatomic molecule, meaning it consists of two oxygen atoms bonded together.
Ozone (O3):
This is a triatomic molecule, meaning it consists of three oxygen atoms bonded together. Ozone is found in smaller quantities than oxygen and is particularly important in the stratosphere where it forms the ozone layer, which protects us from harmful ultraviolet radiation from the sun.
Why other options are incorrect:
(a) Water and ozone:** While water vapor is present in the atmosphere, it is not a form of oxygen. Water has the chemical formula H2O, consisting of two hydrogen atoms and one oxygen atom.
(b) Water and oxygen:** Water is not considered a form of oxygen. Water is a compound made up of hydrogen and oxygen, while oxygen is an element.
(d) Water and carbon dioxide:** Water vapor and carbon dioxide are both greenhouse gases present in the atmosphere. However, neither is a form of oxygen. Carbon dioxide has the chemical formula CO2, consisting of one carbon atom and two oxygen atoms.