Answer:
In the search of food for their survival.
To protect themselves from their enemies.
To get a suitable temperature for their reproduction.
To get a perfect habitat to increase their survival rate.
To get more prey and a safe place.
In search of a better climate that suits their body.
They both have a membrane and vacuole
Shleiden and Theodor Schwann were the first to recognize that all plants and animals are composed of cells.
Hope this helped :)