When an animal or plant decomposes it is providing current life with nutrients from its decomposing body. For instance during a bird's life it will eat worms. Then when the bird dies (if it dies on the ground), it's decomposing body adds to the richness of the soil, which gives life to the worms.
Answer:
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Fifty is larger than forty. :)
"<span>Death Valley, the lowest point in the United States and part of the Mojave Desert, is located in Southern California" is the proper choice. "Southern" in Southern California is capitalized because it's named a distinct region. </span>