When two species occupy the same niche in an ecosystem, the result of the competition is that one species will either have to move to a different environment, or it will die out. which statement best describes the result that competition has on an ecosystem?
a. biodiversity increases, and the overall health of the ecosystem increases.
b. biodiversity decreases, and the overall health of the ecosystem increases.
c. biodiversity increases, and the overall health of the ecosystem decreases.
d. biodiversity decreases, and the overall health of the ecosystem decreases.

Biodiversity decreases, and the overall health of the ecosystem decreases.

Option D

Explanation:

In a niche when two different species occupy a niche competition arises between them. In due course both the species fight for existence and nature selects the best adaptable one to win. The other species either reduces in its population or gradually in struggle for existence they deteriorate and die.

Hence a decrease in bio diversity happens here due to natural selection. If the biodiversity is decreased in a particular niche it affects the growth of different species which in turn affect the whole ecosystem resulting in decrease of the overall health in an ecosystem.

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.  

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.