On inspection of a client's legs, the nurse has found varicose veins. which test should the nurse next perform to determine the competence of the saphenous vein valves?

The model illustrates a process by which a substance is taken up by a cell

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.

Which could be a pathway of food through an ecosystem