Hi, Sulikjon!
The main purpose it to lower the freezing point of water, and we use salt for this.
I hope this helps;)
Speed 80 mph it’s the only relevant thing in the question
The correct answer is B. Oxygen.
Oxygen, as a part of the atmosphere, also participates in UV protection, besides being necessary for breathing.
Answer:
Option A, oxygen in the atmosphere
Explanation:
The highest level of oxygen reached during this phase of the geological cycle of earth. The oxygen level in Carboniferous period accounted for 35% as compared to 21% of oxygen in the atmosphere in present time.
Due to high oxygen content, the giant and wide varieties of terrestrial animal and plant species evolved. For example – size of insects and carwlies increased, plant became extremely giant, increase in number of tree ferns etc.
Answer:
Pluto at the boundary of the solar system,
50% of the solar system's mass comes from the sun