In the 1600s, which scientist discovered microbes in pond water by using a microscope? a. theodor schwann b. robert hooke c. anton van leeuwenhoek d. matthias schleiden

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

What material did the moon come from?

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere