Question

which is the best example of a hypothesis leading to new experimental methods?
gregor mendel influenced the development of the theory that everything is made of cells.
gregor mendel continued the genetic research of thomas hunt morgan, but mendel used pea plants.
thomas hunt morgan continued the genetic research of gregor mendel, but morgan used fruit flies.
the theory that everything is made of cells influenced gregor mendel in his research.

Explanation:

Thomas Hunt Morgan built on Mendel's genetic research and used fruit - flies, which was a new experimental method. Mendel used pea plants. The other statements do not describe a hypothesis leading to new experimental methods.

Answer:

Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.