Human activities often lead to eutrophication of freshwater systems. What are the impacts of eutrophication on lakes? I. Increased nitrogen
II. Decreased algae growth
III. Increased oxygen levels

I only
I and II
II and III
I, II, and III

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.  

maybe because its impossible for balloons to lift a whole entire house.

d. planting trees

the trees take in carbon to make oxygen.