Fuel cells are highly efficient power generating systems that produce electricity. Which of the following statements about fuel cells is false?
A) The only waste product from a fuel cell is water.
B) Fuel cells are not a good transition product from fossil fuels to renewable energy.
C) Fuel cells are efficient based on size and energy output.
D) Fuel cells can be used in automobiles, homes, and power plants.
E) Fuel cells can be used to store large amounts of energy.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

the answer is b.) hydrogen bonds between bases.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.