2. David is growing algae in a closed bottle for an experiment. The bottle is half full of water and half full of air. David floats the bottle in a pond for three weeks. At the end of the three weeks, David notices that lots of algae grew, but the bottle did not sink lower in the pond.

Why didn't the bottle of algae get heavier during the experiment?

A. Tiny animals in the bottle ate the growing algae.

B. The sides of the bottle got lighter as the plastic degraded.

C. The bottle has a leak, which made it lose water to the pond.

D. The growth of the algae came from the air and water in the bottle.

The answer Is D

Explanation:

The growth of the algae came from the air and water in the bottle.

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.