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Theory:

Scientists say the chemicals
In the dust they leave behind,
Could have started life on the earth
Which resulted in mankind.
Explanation:
  
In the fifth stanza, the speaker looks at comets not as destroyers but as creators. Several scientists assert that a comet's role in creating life forms on earth was crucial.
 
Studies claim that the chemicals in the dust that the comets left behind could have started life on earth, eventually leading to the evolution of human beings.
 
According to the researches, "impacts from comets played a major role in the evolution of the earth, primarily during its early history billions of years ago. Some believe that they brought water and a variety of organic molecules to earth."*
 
The shock waves generated when comets collided with the early earth may have aided in generating amino acids and other essential building blocks of life. Comets, which are made up of dust, ice, and compressed gases, are also known to include tiny molecules like carbon dioxide, ammonia, and methanol, which support bacterial growth. Also, "comets may incubate and transfer microbial life from one cosmic habitat to another in the galaxy"**.
 
So, as the speaker pointed out, various studies prove that comets could have brought life to earth.
 
Meanings of difficult words:
 
S.No
Words
Meanings
1
MankindHuman beings considered collectively; the human race
2
EvolutionThe process by which different kinds of living organism are believed to have developed from earlier forms during the history of the earth; the gradual development of something
3
Impact The action of one object coming forcibly into contact with another
4
Organic Relating to or derived from living matter
5
Molecule
The smallest particle in a chemical element or compound which can retain the composition and chemical properties of that substance
6
CollideTo hit by accident when moving
7
Incubate
To maintain (something, such as an embryo or a chemically active system) under conditions favorable for hatching, development, or reaction
8
CosmicRelating to the universe or cosmos, especially as distinct from the earth
9
Habitat The natural home or environment of an animal, plant, or other organism
10
GalaxyA system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
Reference:
State Council of Educational Research and Training (2019). Term-3 English Standard-9. The Comet- Norman Littleford (pp. 95). Published by the Tamil Nadu Textbook and Educational Services Corporation.