What inventions have reduced the need of migration for animals

Talking listening and reacting non verbally are all part of communicating

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of