How do the reproductive habits of koalas affect their genetic diversity?

Koalas, scientifically known as Phascolarctos cinereus. They found in the variety of habitats such as coastal islands and eucalyptus forest.  They live in societies and rely on genetic diversity for survival like any other species. But in case of Koalas, the genetic diversity low over 120 years. Low diversity indicates that they practice inbreeding for reproduction. As a result the population size decreases.  

answer; i believe the correct answer to the above question is ( friction)

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.