Please answer correctly the following question related to the paragraph below. Which class observed fewer protozoa predators keep many bacterial populations under control? The students studied two ponds. Class A studied a pond filled with protozoa, while class B studied a pond with almost no protozoa. Hint: Protozoa generally feed by engulfing and digesting other organisms. As consumers, they have various roles in food chains and webs. Some are predators. They prey upon other single-celled organisms, such as bacteria. In fact, protozoa predators keep many bacterial populations under control. Other protozoa are herbivores. They graze on algae. Still others are decomposers. They consume dead organic matter. There are also parasitic protozoa that live in or on living hosts. For example, the protozoan that causes malaria lives inside a human host. Protozoa are also important food sources for many larger organisms, including insects and worms.
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Answer: class B

Please answer correctly the following question related to the paragraph below. Which city had fewer people with an increased chance of dying from other diseases? Two sister cities were part of an air pollution study. While Prague had big air pollution problems, Belfast was eco-friendly and its inhabitants were healthy. Hint: Air pollution is harmful to human beings and other living things. About 22 million people die from air pollution each year. Breathing polluted air increases the risk of developing lung diseases such as asthma and lung cancer. Breathing bad air also increases the chances of dying from other diseases. Children are most likely to be affected by air pollution. That's because their lungs are still developing and growing. Children also take in more air for their size than adults do. Some air pollutants damage the environment as well as the health of living things. The type of damage depends on the pollutant. Air pollution can also harm the environment.
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Answer: Belfast

Please answer correctly the following question related to the paragraph below. Will the amount of space water takes up increase or decrease when frozen? Samuel fills a glass cup with water and puts it in the freezer. He leaves the cup of water overnight and when he checks in the morning the cup has shattered. Confused he fills another cup with water and just leaves in on his kitchen counter. When he checks in the morning the glass is in tact. Hint: Hydrogen bonds cause water to have a relatively high boiling point of 100C (212F). Because of its high boiling point, most water on Earth is in a liquid state rather than in a gaseous state. Water in its liquid state is needed by all living things. Hydrogen bonds also cause water to expand when it freezes. This, in turn, causes ice to have a lower density (mass/volume) than liquid water. The lower density of ice means that it floats on water. For example, in cold climates, ice floats on top of the water in lakes. This allows lake animals such as fish to survive the winter by staying in the water under the ice.
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Answer:
increase