When does it occur cellular respiration

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 are scientists concerned about the depletion of the ozone levels in the stratosphere?

What makes a dominant allele different from a recessive allele