Which of the following are true?
i. the greenhouse effect and global warming are the same thing.
ii. without the greenhouse effect there would be no life on earth.
iii. some of the radiation flowing from the earth to space is absorbed by greenhouse gasses and re-radiated back to the surface and out to space.
iv. co2 makes up about 96% of mars atmosphere

IV. CO2 makes up about 96% of Mars atmosphere.

Explanation:

The atmosphere of mars is colder than that of the earth's, this is due to the larger distance from the sun. As a result of this the Mars receive the less solar energy and have a low temperature.

The gaseous composition of Mars includes the carbon dioxide (96%), nitrogen (2.6%), and argon (1.9%). The other trace level gases includes the water vapor, carbon monoxide, oxygen, hydrogen and other forms of noble gases.