Please hurry ill give brainliest What are the ways in which a scientific report could be biased?

picking certain people to be test subjects (for example if they wanted to test how people reacted to something and it was meant to mean for everyone but the only people tested were white males) or not seperating controls and having multiple factors or not taking into account a placebo effect.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.