What department is responsible for border safety and security; science-related concerns pertaining to chemical, biological, and nuclear threats; emergency preparedness; and information and intelligence analysis and assessment

Department of Homeland Security.

Explanation:

Department of Homeland Security works in the civilian sphere to protect the United States within, at, and outside its borders. Its stated goal is to prepare for, prevent, and respond to domestic emergencies, particularly terrorism.

The Department of Homeland Security has a vital mission: to secure the nation from the many threats we face. This requires the dedication of more than 240,000 employees in jobs that range from aviation and border security to emergency response, from cybersecurity analyst to chemical facility inspector. Their duties are wide-ranging, and their goal is clear - keeping America safe.

The United States Department of Homeland Security (DHS) is a cabinet department of the U.S. federal government with responsibilities in public security. Its is saddled with the duties of anti-terrorism, border security, immigration and customs, cyber security, and disaster prevention and management.

It was established in November 2002 after the 9/11 to avoid future occurrence.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.