Which experimental design decision would most likely produce invalid and unreliable results

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.

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine