Why do plants need both a cell membrane and a cell wall?

Plant cells are somewhat unique because unlike animal cells, plant cells contain both a cell wall and cell membrane. ... The cell wall is a protective layer outside the cell membrane that also provides support for the cell's structure.

Explanation:

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: