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identify the relative abundance and descriptions of some of the gases in the atmosphere
second most
abundant gas in
the atmosphere
does not
react with other
substances
required for aerobic
cellular respiration
required for
photosynthesis
incorporated as a
major component of
proteins and dna
most abundant gas
in the atmosphere
trace gas
gas
relative
abundance
description
carbon
dioxide
nitrogen
oxygen

1. Carbon dioxide: a trace gas .

It is required for photosynthesis.

2. Nitrogen: most abundant gas in the atmosphere .

It is incorporated as a major component of proteins and DNA.

3. Oxygen: second most abundant gas in the atmosphere .

It is required for aerobic cellular respiration.

Explanation:

Gases that are less abundant in the atmosphere are called trace gases. Carbon dioxide gas is the product of respiration in animals which is then used by the plants for photosynthesis. It is present in the environment at very small concentration ( 0.04%).

Nitrogen and Oxygen both are present in the atmosphere at high proportions. Nitrogen covers 78% of the total gases volume whereas oxygen is about 28% in the atmosphere. It is vital in many biochemical processes that sustains life on Earth; for example, it is used in the production of nitrogen bases (purine and pyrimidine) and amino acid which are required for DNA and protein synthesis. Likewise, oxygen is an oxidizer which is required for aerobic cellular respiration.

substitution is the answer in this case