Onion leaves are green. Students testing onion leaves for the presence of starch used the method shown in the four stages of Fig 20.1 Explain the reasons for the details shown in each stage.
reasons for stage 1 .
reasons for stage 2 .
reasons for stage 3 .
reasons for stage 4 .

3points hurry! what is the relationship between biotechnology, sharkskin, and disease resistance? bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it. disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks. scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease. sharkskin produces many chemicals that can be collected and used to create antibiotics.

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

Which step is not included in the step approach to calculating the greatest common divisor?