White House. Washington, D.C. White House, formerly known as the Executive Mansion (1810â1902), the official office and residence of the president of the United States at 1600 Pennsylvania Avenue N.W. in Washington, D.C. The White House and its landscaped grounds occupy 18 acres (7.2 hectares).
Quick Answer. Ecological balance is a theory stipulating that natural conditions, including numbers of various animal and plant species, remain stable on their own through variations over time.
A. Introduce the ecological principles of biotic and abiotic factors; B. Connect the principles to this case study about Baltimore streams. Discussion. Key Idea: Ecosystems have a natural balance of abiotic and biotic factors. Question: What is the definition of an ecosystem? Answer: An ecosystem is an area that includes all the interconnected living (biotic) and non-living (abiotic) components. Question: In