Option 1: This option states that the temperature of the Earth`s surface would be dependent on the amount of oxygen in the atmosphere. However, carbon dioxide, not oxygen, is the main greenhouse gas that affects the temperature of the Earth. So, this option is not correct.
Option 2: This option suggests that the temperature of the Earth`s surface would be higher than the present if there is no carbon dioxide in the atmosphere. This is incorrect because carbon dioxide acts as a greenhouse gas, trapping heat and keeping the Earth warm. Without carbon dioxide, the greenhouse effect would be weakened, leading to lower temperatures.
Option 3: This is the correct answer. Without carbon dioxide in the Earth`s atmosphere, the temperature of the Earth`s surface would be less than the present. As mentioned earlier, carbon dioxide acts as a greenhouse gas, trapping heat and keeping the Earth warm. Removing it would reduce the greenhouse effect, resulting in cooler temperatures.
Option 4: This option suggests that the temperature of the Earth`s surface would remain the same without carbon dioxide in the atmosphere. However, as explained above, removing carbon dioxide would impact the greenhouse effect and lead to changes in temperature. Therefore, this option is not correct.
In conclusion, without carbon dioxide in the Earth`s atmosphere,