Regarding the structure and components of an ecosystem, which of the following statements are accurate?
a. An ecosystem is a functional unit of nature where living organisms interact only among themselves.
b. Stratification refers to the horizontal distribution of different species occupying different levels in a terrestrial ecosystem.
c. The four basic components of an ecosystem function are Productivity, Decomposition, Energy flow, and Nutrient cycling.
d. In a pond ecosystem, phytoplankton and algae are examples of autotrophic components.
e. The decomposers in a pond ecosystem are found abundantly at the bottom and include fungi, bacteria, and flagellates.
