Answer:
An amoeba's economic value can be found in medicine and nutrient recycling. According to Biology Reference, certain amoeba species can cause sickness and death, while others are important in maintaining healthy ecosystems because they recycle the nutrients needed by bacteria and keep the bacterium population under control.
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Answer:
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The four types of macromolecules in cells are nucleic acids, lipids, proteins, and carbohydrates.
The sentences that make sense are "Volatile liquids are flammable" and "Liquids burn easily."
