Question

Life cannot sustain on Mars and Venus because of

• A. Oxygen
• B. Carbon dioxide
• C. Nitrogen
• D. Ozone

Answer 1

The correct option is B

Carbon dioxide

The correct option is option B

The explanation for the correct option:

1. Mars' atmosphere is far too thin to support life. Venus' atmosphere is extraordinarily thick, the temperature is extremely high, and sulphuric acid rains.
2. The major component of the atmosphere found on Venus and Mars is carbon dioxide (95-97%) and as such it does not support life.

The explanation for the incorrect option:

Option A:

Oxygen is a colorless, odorless, and tasteless gas that is taken up by animals and converted to carbon dioxide by plants; plants, in turn, use carbon dioxide as a carbon source and return oxygen to the environment.

Option C:

It is a common element in earth's crust, with the Milky Way and the Solar System having the fifth-highest total abundance.

Option D:

1. Three oxygen atoms make up ozone (O₃), a highly reactive gas.
2. It is a natural and man-made product that exists in the upper and lower atmospheres of the Earth.
3. Ozone has a positive or negative impact on life on Earth depends on its location in the atmosphere.

Final answer: Life cannot sustain on Mars and Venus because of carbon dioxide.