Scientists use tissue cultures to study possible medicines that can be used to treat cancer patients. What is one benefit of this procedure? Patients do not receive harmful or ineffective medication.
The cultured cells are not in their normal environment.
Doctors know how to treat all types of cancer.
One tissue culture can be used for all cancer patients.

A. Patients do not recieve harmful or ineffective medication.

Explanation:

Scientist use tissue cultures to study possible medications for the patients so that the patients aren't put in harms way to test a drug that would not work or be harmful.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.