What is the term used for organisms moving into a area?

Invasive species are species that are introduced into an environment but are not naturally found in that environment. One example of an invasive species is the America gray squirrel, introduced into Britain at the end of the 18th century.

Explanation:

Migration or migrating

its the cell wall and the they are unique to plant

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.