<em>Answer:</em>
<em>Limestone is a type of carbonate sedimentary rock. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate. A closely related rock is dolomite, which contains a high percentage of the mineral dolomite, CaMg(CO₃)₂.</em>
<em>Limestone has numerous uses: as a building material, an essential component of concrete (Portland cement), as aggregate for the base of roads, as white pigment or filler in products such as toothpaste or paints, as a chemical feed stock for the production of lime, as a soil conditioner, and as a popular decorative .</em>
<em>Limestone is formed in two ways. It can be formed with the help of living organisms and by evaporation. Ocean-dwelling organisms such as oysters, clams, mussels and coral use calcium carbonate (CaCO3) found in seawater to create their shells and bones.</em>
<em>LIMESTONE MEANING:</em>
<em>a rock that is formed chiefly by accumulation of organic remains (such as shells or coral), consists mainly of calcium carbonate, is extensively used in building, and yields lime when burned.</em>
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The correct answer is C; Zero tolerance.
Further Explanation:
Schools now have a zero tolerance policy that refuses to have exceptions for anyone for any reason. There have been kindergarten students who made gestures with their hands mimicking a gun and were expelled from school.
Studies have shown that the zero tolerance policy has helped to reduce incidents in schools all over the United States. This helps to keep the other children disciplined and better behaved.
Schools may implement several disciplinary actions against students who break the zero tolerance policy such as;
- expulsion for entire school year
- removed from the school district
- expelled for up to 6 weeks
Learn more about zero tolerance at brainly.com/question/1094860
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B . Push blood from the vertices to the arteries , and ventricles push blood from the veins to the atria
