Question

(d) Why did the rats come out? Where did they go?​

Answer 1

Answer:

They're sometimes called the “ship rat” because they've been spread around the world on ships. ... Most pet rats and lab rats are brown rats. They originally came from China and spread around the world later than black rats. They probably arrived in Europe around the 1300s and spread worldwide in the late 1700s.

Explanation:

They're also known as the “roof rat” because they like to live in roofs. Rattus rattus is originally from India and began to live with humans more than 4,000 years ago, and slowly spread west into Europe about 3,000 years ago. Then there's the brown rat (which scientists would call Rattus norvegicus).