Scientific Theories and Hypotheses
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Questions and Answers

What is the primary difference between a scientific theory and a law?

  • A theory is used to make predictions, while a law is used to explain phenomena
  • A theory is widely accepted, while a law is not
  • A theory explains why something happens, while a law describes what happens (correct)
  • A theory is a guess, while a law is a proven fact

    • What is required for a hypothesis to become a scientific theory?

  • It must be widely accepted by the general public
  • It must be proposed by a famous scientist
  • It must be tested over and over again and supported by a great deal of evidence (correct)
  • It must be tested once and supported by a little evidence

    • What is the difference between the way 'theory' is used in science and in everyday life?

  • In science, a theory is a well-supported explanation, while in everyday life, it is a guess or hunch (correct)
  • In science, a theory is a hypothesis, while in everyday life, it is a fact
  • In science, a theory is a guess, while in everyday life, it is a proven fact
  • In science, a theory is a law, while in everyday life, it is a hypothesis

    • What is the process by which evolution occurs?

    <p>Natural selection</p> Signup and view all the answers

    What is a characteristic of a scientific theory?

    <p>It is a widely accepted explanation that is well-supported by evidence</p> Signup and view all the answers

    What is an example of a well-known theory in biology?

    <p>The theory of evolution</p> Signup and view all the answers

    What is the main idea behind the theory of evolution by natural selection?

    <p>That living things produce more offspring than others to pass genes to the next generation</p> Signup and view all the answers

    What is a common characteristic among the three scientific theories mentioned?

    <p>They all have evidence that supports them with no evidence against them</p> Signup and view all the answers

    What is the main idea behind the germ theory of disease?

    <p>That microorganisms cause many diseases</p> Signup and view all the answers

    What do the cell theory and the theory of evolution by natural selection have in common?

    <p>They both have evidence that supports them with no evidence against them</p> Signup and view all the answers

    What is the cell theory primarily concerned with?

    <p>The smallest unit of structure and function of living organisms</p> Signup and view all the answers

    What can be inferred about these scientific theories?

    <p>They are all supported by evidence with no evidence against them</p> Signup and view all the answers

    Study Notes

    Scientific Theories

    • A scientific theory is a broad explanation for events that is widely accepted as true, supported by a great deal of evidence from repeated testing.
    • A hypothesis must be tested over and over again to become a theory.
    • A theory explains why something happens, whereas a law only describes what happens.

    The Theory of Evolution

    • The theory of evolution by natural selection explains how living things are changing today and how modern living things have descended from ancient life forms.
    • Evolution is a change in the characteristics of living things within a species over time through natural selection.
    • Natural selection occurs when some living things produce more offspring than others, passing more genes to the next generation.
    • The theory is well-supported, and no evidence has been identified that proves it is incorrect.

    The Cell Theory

    • The cell theory states that the cell is the smallest unit of structure and function of all living organisms.
    • All living organisms are made up of at least one cell.
    • Living cells always come from other living cells.
    • No evidence has been identified that proves this theory is incorrect.

    The Germ Theory

    • The germ theory of disease proposes that microorganisms are the cause of many diseases.
    • A vast amount of evidence supports this theory, and no evidence has been identified that proves it is incorrect.

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    Description

    Understand the difference between scientific hypotheses and theories, and how hypotheses become theories through repeated testing and evidence.

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