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.

The correct answer for the first question is- B) Mechanical.

Adaptation can be described as a process of change in an organism over time that facilitates its survival in the changing environmental conditions. It results due to mutation or genetic change in the individual that gives a benefit to the organism. It exhibits change in structure ( like succulent plants in desert), function, or behavior.

Mechanical is not a type of adaptation as it deals with movement of objects.

The correct answer for second question is- C) Variations.

Variation among organisms in a population results from change in the genetic material or their genetic sequences. Change at the genetic level is thus reflected in the phenotypes ( like different color of feathers in birds).

Thus, difference is in the feather color reflects variations.