Прочитайте текст и определите какой из заголовков соответствует тексту. Colloids exist in nature in ...: ответ на тест 911698 - Английский язык

Colloids exist in nature in the cells of plants and animals, in the sap of certain plants, among which is the rubber tree, and in the class of foods are called proteins. Colloids have recently come to be of tremendous importance in certain manufacturing processes, including the making of glass, rubber and artificial silk, tanning leather and dyeing.
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Colloids exist in nature in the cells of plants and animals, in the sap of certain plants, among which is the rubber tree, and in the class of foods are called proteins. Colloids have recently come to be of tremendous importance in certain manufacturing processes, including the making of glass, rubber and artificial silk, tanning leather and dyeing.
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Benjamin Franklin is acknowledged to be the founder of the theory of atmospheric electricity. He was the first to prove that the lighting was an electrical phenomenon. Franklin developed a new theory of electricity that he called positive and negative. He finally invented a means of protection against the disastrous effects of lighting – the lighting rod. Franklin is known and respected all over the world not only as a scientist but also as a citizen who did as much as he could for the good of his country. Coming out in defence of the Afro-Americans, Franklin declared slavery to be not only an evil from the moral point of view, but also an obstacle to the social interests of America. He is thought to be one of the broadest as well as one of the most creative minds of his time.

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It may be observed that when the water of a pan of brine is evaporated by boiling, crystals of salt remain on the bottom of the vessel. The experiment proves that salt crystals are formed by evaporation of a solution.

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Airships are huge balloons with propellers to drive them, and they were once used to carry as many as 200 passengers.
The airships were filled with hydrogen, a light gas. However, hydrogen is also inflammable. There were several disasters in which airships caught fire, and they disappeared by the end of the 1930s.
However, airships are now flying again, but they are not common. They are lifted by helium gas, which does not catch fire.

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There are uncountable combinations of atoms. For example, 4 carbon atoms combine with 10 1_______ atoms to make up a butane molecule. A glucose molecule is made from 6 carbon atoms, 12 hydrogen atoms and 6 oxygen 2_______. Cellulose, the principal molecule in the plant cell walls and also in wood, paper, 3_______, and many other materials, is a chain that can include up to 12,000 glucose molecules. A sugar molecule is made from carbon, hydrogen and oxygen atoms grouped in specific positions. When these same atoms are grouped in different positions they can form alcohol or starch. The different proportions and positions of the atoms produce the 4_______ forms of matter.