How do you come up with a good question on base a good science investigation

Which of these statements are true about scientific theories and hypothesis

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what