A student prepared a slide of onion epidermis to observe under a microscope. Two of the slides she prepared are shown in Figure 3.

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3.1

Describe what is wrong with slide A.

Suggest how this problem can be avoided.

3 . 2

Describe what is wrong with slide B.

Suggest how this problem could be corrected.

3.3

When observing a slide under the microscope you must first use the lowest power objective lens.

Explain why this is important.