Billy is sitting in a chair in class. if the action force is the downward push of his weight on the chair, what is the reaction force?
a. there is no reaction force
b. the upward force of the chair pushing on billy
c. the downward force of billy's weight on the earth
d. the upward force of the earth on billy

Osmosis is often viewed incorrectly as a process driven directly by differences in solute concentration across a selectively permeable membrane. what really drives osmosis? view available hint(s)osmosis is often viewed incorrectly as a process driven directly by differences in solute concentration across a selectively permeable membrane. what really drives osmosis? the first law of thermodynamicsthe difference in the height of water columns on either side of a selectively permeable membranethe difference in water concentration across a selectively permeable membranethe difference in sugar or ion concentration across a selectively permeable membrane

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?