Chооse the letter оf the sentence thаt best expresses the implied mаin ideа of each of paragraph. Often, a colony of tiny yellow ants lives near a colony of larger ants. These yellow ants, "thief" ants, support themselves by raiding the larger ants' tunnels and stealing their food. Then they escape through tunnels so tiny that the big ants cannot follow them. Several other species of ants are slave-keepers. In North America, for instance, there is type of large red ant that makes slaves of smaller black ants. The red ants raid the nests of the smaller ones and carry away their young. Although the red ants can support themselves if necessary, they prefer to make the kidnapped ants do their work. Still another type of ant, the amazon ant, has lost its ability to support itself, Instead, it captures slaves from other nests and depends upon them to work. They become aggressive, even helping the amazons conduct slave raids on their own former colony.
Chооse the letter оf the inference thаt is most firmly bаsed on the given fаcts. When you stir sugar into a glass of water, the sugar granules break up into individual molecules that disperse throughout the water. The resulting mixture is called a solution. A solution forms when the particles of one substance are dispersed into another substance to make a uniform mixture. Solutions can be mixtures of gases; mixtures of liquids; mixtures of gases and liquids; or mixtures of gases, liquids, or solids. For example, fish get the oxygen they need from the oxygen dissolved in water. A substance that can dissolve other substances is called a solvent. The substance that dissolves in the solvent is called the solute. Water is often called the "universal solvent" because it can dissolve a great variety of substances. Most of the chemical processes of living things take place in water solutions. In fact, life on Earth would not be possible without water.