Persistent organic pollutants are the main concern when looking at bioaccumulation and biomagnification true or false

About how much of the cell mass is watet

What's the waste product of electrons and pyruvate combining in fermentation?  

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping