I hope it helps Cardiac Valves The atrioventricular valves are located on the floor of the atria and empty into the ventricles. These valves are composed of leaflets attached to papillary muscles in the ventricle via thin cord-like structures called chordae tendineae.
I believe it is A because I know Nonpoint source pollution can include excess fertilizers, herbicides and insecticides from Agricultural lands and residential areas. I hope it is right.. please let me know
