Answer: Double blind clinical trial
Explanation:
The situation that is seen here is double blind clinical trail in which neither the participant nor the practitioner knows who is receiving the treatment.
This is used to prevent biasing in the experiment which is caused due to demand characteristics or placebo effect.
Here, in this situation the dog handlers and the experimental observer both were blinded to identify the breath sample.
They Protect Us From Risk
No because sometimes they have to put animals down and that’s something I, as a full hearted human, could not do.
Answer: Activities include teaching English, working in orphanages, conservation, assisting non-governmental organizations and medical work. International volunteering often aims to give participants valuable skills and knowledge in addition to benefits to the host community and organization.
Explanation: Volunteers carry out 90 percent of the humanitarian work of the Red Cross. They help victims of disaster, provide care and comfort to ill and injured service members and veterans, teach others lifesaving skills such as First Aid and CPR, help staff blood drives and much more.
