Southern California is the main benefactor of the electricity generated by the Hoover Dam.
Hoover dam was begun under the administration of President Herbert Hoover but completed as public works during the Roosevelt administration. Hoover dam became part of a much larger multipurpose water development project that tamed the wild Colorado River.
Answer: FOSSIL OF FISHES.
Explanation: The law of faunal succession, is based on the observation that sedimentary rock strata contain fossilized flora and fauna. These fossils succeed each other vertically in a specific, reliable order that can be identified over wide horizontal distances. According to this law, the order for animals is as follows; animals with shells; fishes; amphibians; reptiles; mammals; birds; humans.
To survive they have made modified leaves into spines to prevent excessive loss of water from the plant body and deep roots to get to a water source.
