Which is the principle means of communication?Why?

Doctors recommend that both men and women take an aspirin every day to prevent heart attacks. however, the sample in the research study only contained men. the problem with doctors making this aspirin recommendation reflects a bias.

The bishnoi conservationist is take care of nature and grow with it, instead of exploiting it explain the statement

Marcy tests a solution with a strip of blue litmus paper. the paper turns red. the solution is acidic basic neutral