Answer the following questions by selecting the correct/most appropriate options.

Which of following two gases make up the bulk of the Atmosphere ?

Correct option is B

The correct answer is Nitrogen and Oxygen.
Nitrogen and oxygen are the two primary gases that constitute the bulk of the Earth's atmosphere, with nitrogen making up approximately 78% and oxygen about 21%. This composition is crucial for sustaining life on Earth, as nitrogen is essential for the synthesis of amino acids, which are the building blocks of proteins, and oxygen is necessary for cellular respiration in most living organisms.
 The presence of these gases in such proportions creates a stable environment that supports a wide variety of life forms.
 Other gases mentioned, like carbon dioxide, ozone, and helium, are present in much smaller quantities.
 Carbon dioxide, although critical for photosynthesis and regulating Earth's temperature, makes up only about 0.04% of the atmosphere.
 Ozone plays a vital role in protecting living organisms from harmful ultraviolet radiation, and helium is a noble gas with limited biological significance.