Do genes make up chromosomes or do chromosomes make up genes?

Which of these statements are true about scientific theories and hypothesis

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

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.