Hela cells are a group of cells that were removed from henrietta lacks in 1951. these cells have been growing ever since they were removed. which research tool best aids in growing a large number of cells outside of a body over a long period of time?

microscopes

cell culturing

immunostaining

genetic methods

Cell culturing

Explanation:

-Microscope is a tool that is used to be able to see objects that are really small.

-Cell culturing  is a process to grow cells outside their environment.

-Immunostaining  is a method in which antibodies are used to identify an antigen.

-Genetic methods refers to the techniques that are used to analyze genetic phenomena.

According to this, the research tool that best aids in growing a large number of cells outside of a body over a long period of time is cell culturing.