In Science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

   After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists’ predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected.

   Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves arc not science. As the mathematician Jules Henri Poincare said: "Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house."

   Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses. In a way, any hypothesis is a leap into the unknown. It extends the scientist's thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.

Which of the following statements is supported by the passage?

Câu hỏi liên quan

• Which of the following concepts is defined in the passage?

• The word “fledgling” in the third paragraph could be best replaced by which of the following?

• According to the passage, why do ants use different compounds as trail pheromones?

ZUNIA12

• It can be inferred from paragraph 1 that Mantle ______.

• What percent of the earth’s area do rain forests cover?

• In the passage, the expression “children interrupt their education to go to school” mostly implies that ..........

• What does the word concentric mean?

• The author’s purpose of writing this passage is to_______.

• The word “prior” is CLOSET meaning to ...............

• According to this passage, what is a signal?

• According to the passage, what does a constricted and harsh voice indicate?

• Which of the following statements about primary cooperation is supported by information in the passage?

• What does the author mean by staring that, "At interpersonal levels, tone may reflect ideas and feelings over and above the words chosen" ?

• The word “cues” in the passage is closest in meaning to ........

• Which of the following was NOT mentioned in the passage as a source of information for The Sea Around Us?

• Which of the following is NOT mentioned in paragraph 3 about earthquakes?

• The word ‘akin’ in paragraph 1 could be best replaced by __________.

• It can be inferred from the passage that, in summer, ________.

• What does the writer’s mother look like?

• The phrase broke out in paragraph 2 is closest in meaning ...............