Answer the following question given this paragraph: The process in which an atom becomes an ion is called ionization. It may occur when atoms are exposed to high levels of radiation. The radiation may give their outer electrons enough energy to escape from the attraction of the positive nucleus. However, most ions form when atoms transfer electrons to or from other atoms or molecules. For example, sodium atoms may transfer electrons to chlorine atoms. This forms positive sodium ions (Na + ) and negative chloride ions (Cl - ). You can see an animation of this process at the URL below. Q: What is the process in which an atom becomes an ion known as? Choices: - electrification - evaporation - oxidation - ionization A:
ionization
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Answer the following question given this paragraph: Q: What part of the sporophyte produces microspores that form male gametophytes and megaspores that form female gametophytes? Choices: - chloroplasts - pollen - leaves - flower A:
flower
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Answer the following question given this paragraph: Many structures in fish are adaptations for their aquatic lifestyle. For example, fish have a stream-lined body that reduces water resistance while swimming. Q: A fish's stream-lined body that reduces water resistance is an example of what kind of response to an aquatic lifestyle? Choices: - natural selection - retraction - evolution - adaptation A:
adaptation
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Answer the following question given this paragraph: Puberty is the stage of life when a child becomes sexually mature. Puberty begins when the pituitary gland tells the testes to secrete testosterone in boys, and in girls the pituitary gland signals the ovaries to secrete estrogen. Changes that occur during puberty are discussed in the Male Reproductive Development and Female Reproductive Development concepts. Q: What is the name of the stage of life when a child becomes sexually mature? Choices: - pre-adolescence - adulthood - reproductive stage - puberty A:
puberty
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