Question

Which of the following elements of matter would best convey that there is life on earth
A. Oxygen
B. Hydrogen
C. Carbon
D. Iron

Answer 1

Hint: Matter which is responsible for life on earth will be a biotic component and with the help of the component the various biological processes can take place. The main reason behind sustaining life is the well-functioning biological activities of living beings.

Complete Answer:
The trace shows that the life sustain on any planet is due to the presence of the carbon element on the planet. The matter which would best convey that there is life on earth is carbon. With the help of carbon it can be traced to the life cycle of the living being after so many years. The biological diversity sustains on the planet due to the presence of carbon in them. Without carbon no one can proceed in their biological life. With the help of carbon, oxygen and hydrogen can be obtained from trees and biodiversity. Therefore it is a crucial matter for life to sustain on any planet.
Iron is not an important part of life to sustain on the planet. From tiny to large organisms present on the earth are made up of carbon and every carbon is genetically inherited from their ancestors.

Therefore the correct option is option C. carbon.

Note:
Living organisms are basically made up of carbon which further helps in important biological processes like respiration and other. Trees and plants are also made of carbon which helps in generation of oxygen and water molecules in the atmosphere. Carbon is thus an important and crucial component of the environment for sustainment of life on earth.