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Sagot :
Answer: B. Stage
Explanation: A microscope is a specially designed tool used by many scientists to view small objects. It is an instrument composed of many parts, with each part having an important structural function. The stage of a microscope is a flat surface above the base of the microscope where one is meant to place the specimen slide for observation.
There is no part of a microscope that is only known as the substage. However, there is a part known as the substage condenser. The substage condenser is an apparatus underneath the stage that collects light and focuses it on the specimen being viewed. It does not hold the specimen slide. Thus, choice a is incorrect.
Choice C is incorrect because the arm of a microscope is a supportive structure that holds the head of the microscope and connects it to the base for greater structural integrity. It plays no part in holding the specimen slide.
Choice D is incorrect because the objective refers to the lens of a microscope that are meant to be used to capture light and observe the specimen. The objective lens help view the specimen, but they do not hold it.
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