Determine whether the source given below has the potential to create a bias in a statistical study.
washington university obtained word counts from the most popular novels of the past five years.

What protects the lining of the stomach from acidic gastric juices?

Which table best shows the impacts resulting from human activity? impact of human activities human activity impact forest area cleared to construct an airport increase in oxygen level vegetation cleared to construct an oil mine increase in pollution impact of human activities human activity impact forest area cleared to construct an airport increase in sound pollution vegetation cleared to construct a power plant contamination of water impact of human activities human activity impact beehives cleared from urban areas increase in vegetation dams constructed on a river increase in fish population impact of human activities human activity impact beehives cleared from urban areas increase in bird population dams constructed on a river better quality of water

Some substances but not other can cross the (blank) membrane of a cell