Q: These microorganisms are abundant in the human digestive track and serve many roles. what are they? Read this paragraph and choose the correct option from the provided answers: Bacteria provide vital ecosystem services. They are important decomposers. They are also needed for the carbon and nitrogen cycles. There are billions of bacteria inside the human intestines. They help digest food, make vitamins, and play other important roles. Humans also use bacteria in many other ways, including:. Choices: - antioxidants - pathogens - tumors - bacteria A:
bacteria
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Q: What do covalent bonds give atoms a more stable arrangement of? Read this paragraph and choose the correct option from the provided answers: Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the oxygen atoms in the Figure above . Alone, each oxygen atom has six valence electrons. By sharing two pairs of valence electrons, each oxygen atom has a total of eight valence electrons. This fills its outer energy level, giving it the most stable arrangement of electrons. The shared electrons are attracted to both oxygen nuclei, and this force of attraction holds the two atoms together in the oxygen molecule. Choices: - protons - neutrons - cell walls - electrons A:
electrons
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Q: An example of beta decay is the emission of an electron by a carbon-14 what? Read this paragraph and choose the correct option from the provided answers: Transmutation also occurs when a nucleus undergoes decay. An example of beta decay is the emission of an electron by a carbon-14 nucleus. Choices: - molecules - ion - protons - nucleus A:
nucleus
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Q: What happens if a person doesn't take in enough water to replace the water lost in sweat? Read this paragraph and choose the correct option from the provided answers: The boy in Figure below is taking a water break while playing outside on a hot day. If he doesn't take in enough water to replace the water lost in sweat, he may become dehydrated. Symptoms of dehydration include dry mouth, headache, and dizziness. Dehydration can be very serious. It can even cause death. Choices: - diarrhea - fatigue - relaxation - dehydration A:
dehydration
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