It can be observed and tested
ethical scientist would follow scientific method they would also report accurate data and they're going to keep detailed records now an ethical scientist is not going to hide their experiment from the public the only reason you're going to hide your experiment from the public would be because you have something to hide being on ethical and it would also be unethical to make an unbiased conclusion
The answer is C)Resistant bacteria cannot be attacked by penicillin
Cyanobacteria which is a type of algae. It conducts photosynthesis and without it there may not have been life today because they didn't need oxygen to survive and in order to have oxygen there had to have been some form of life...