Air pollution is caused the burning of fossil fuels, resulting in the formation of smog and acid rain.
<h3>What is air pollution?</h3>
Air pollution is the release of harmful substances into the air which makes it unfit and unhealthy for breathing.
Substance which pollute the air are known as air pollutants. 
The burning of fossil fuels causes dangerous gases to enter the atmosphere. Heavy, dense fog caused by dangerous gases mixing in the atmosphere is called smog. Acid rain occurs when dangerous gases mix in the atmosphere and fall back to the surface in liquid form.
Therefore, air pollution is caused by releasing pollutants air.
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C. calcium is your answer
        
             
        
        
        
Fibrin is an insoluble component of plasma that forms a meshwork of strands and is considered the structural basis of clot formation.
<h3>What is clot formation?</h3>
- Blood turns from a liquid to a gel during coagulation, which results in the formation of blood clots.
 - Possible outcomes include haemostasis, which stops blood loss from a broken vessel, followed by repair.
 - The activation, adhesion, and aggregation of platelets, as well as the deposition and maturation of fibrin, are all components of the coagulation process.
 
<h3>What is fibrin?</h3>
- A fibrous, non-globular protein called fibrin is necessary for blood to clot.
 - It is created when fibrinogen undergoes polymerization due to the protease thrombin.
 - A haemostatic plug or clot is formed over a wound site by platelets and polymerized fibrin.
 
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Explanation:
The salt solution is meant to lower the ice melting point hence keep most of the water from turning into ice even at zero degrees temperatures. The salts are dissolved in the water to form a salty solution that percolates the ground and reach plant roots. Because the salty water is hypertonic (more concentrated) to the cell cytoplasm of the plant roots, water is drawn from the plant by osmosis. This is the reversal of normal plant root absorption of water from the soil. This causes the plant root to wither and subsequently the whole plant to die. Remember in osmosis, water moves from the less concentrated solution to the more concentrated solution through a semipermeable membrane.
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