Multicellular plants and animals are composed of eukaryotic cells. Their origin must therefore postdate the origin of this cell type. It is probable that all living multicellular animals shared a single common ancestor. Molecular data provide widely divergent results, but suggest that this common ancestor arose between 1 and 1.6 billion years ago.
The fossil record of metazoans is more recent, and older fossils are sometimes regarded with suspicion by experts. The oldest common and widely accepted metazoans are members of the Ediacaran fauna (see opposite), found in rocks dated at between 570 and 543 million years old.
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This is common knowledge that disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.