Question

what best describes the modern use of hela cells?
were never used at all
still in use today
was only used in the 1950s
stopped being in use in 2010

Explanation:

HeLa cells are a type of immortal cell line derived from cervical cancer cells of Henrietta Lacks. They have been widely used in scientific research since their discovery in the 1950s. These cells are still in use today for various purposes such as studying cancer, developing vaccines (e.g., the polio vaccine), and understanding cellular processes. They were not "never used at all" as they have had a long history of use. They were not "only used in the 1950s" as their use has continued beyond that decade. And they did not "stop being in use in 2010" as research with HeLa cells is ongoing in modern times.

Answer:

still in use today