Answer the following question given this paragraph: When you think of muscles, you might think of biceps and the external muscles you see in a bodybuilder. However, some muscles are found deep inside your body. The heart, for example, is a very muscular organ. It has to pump blood all around your body. Q: Which muscular organ pumps blood all around your body? Choices: - stomach - lungs - pancreas - heart A:
heart
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Answer the following question given this paragraph: A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). Dependent variables change in response to the independent variable. Q: The values of which factors are controlled by the experimenter over the course of an experiment? Choices: - other variables - independent elements - independent approaches - independent variables A:
independent variables
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Answer the following question given this paragraph: Consumers take in food by eating producers or other living things. Q: What members of an ecosystem food chain take in food by eating producers or other living things? Choices: - primary producers - decomposers - insectivores - consumers A:
consumers
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Answer the following question given this paragraph: Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the hydrogen atoms in Figure above . Alone, each hydrogen atom has just one electron. By sharing electrons with another hydrogen atom, it has two electrons: its own and the one in the other hydrogen atom. The shared electrons are attracted to both hydrogen nuclei. This force of attraction holds the two atoms together as a molecule of hydrogen. Q: What bonds form because they give atoms a more stable arrangement of electrons? Choices: - Hydrogen bond - Ionic bond - Polar bond - covalent A:
covalent
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