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.

a- all cells come from pre-existing cells

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.