The Clean Water Act (CWA) establishes the basic structure for regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface waters. The basis of the CWA was enacted in 1948 and was called the Federal Water Pollution Control Act, but the Act was significantly reorganized and expanded in 1972. "Clean Water Act" became the Act's common name with amendments in 1972.
Plants have the cell wall and the chloroplast. Animal cells share everything else in the cells.
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A biotic factor is a living organism that shapes its environment. In a freshwater ecosystem, examples might include aquatic plants, fish, amphibians, and algae. Biotic and abiotic factors work together to create a unique ecosystem.
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Answer:
D
Explanation:
The igneous rock then breaks apart over time through the process of weathering. Being buried deep under the surface in areas of high temperatures and pressures or coming in contact with magma can cause these sedimentary rocks to change to metamorphic rocks. Diagram 1 shows layers of rocks around and under a volcano.
<span>several blossom on a flower stick together and develop in to a single fruit
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