In In what organ do sperm develop

Explain why the plants cortex would serve as the best food source for animals

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic