When the ventricles contract, the valve prevents blood flow from the: A ventricle to atrium
B atrium to ventricle
C left ventricle to the right ventricle
D right atrium to the left atrium

Chalk is an ionic compound. which is a property of all ionic compounds that makes chalkboard? particularly useful for writing on a a high melting point hardness and brittleness inability to dissolve in water a multicolored appearance

Which of the following is the most likely outcome of global warming

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?