Where in the body do you think pepsin and trypsin are the most active individually

Dna replication or repair occurs in a cell in all of thw following situations except when

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

Fredrick griffith made a scientific discovery in 1928