Although some scientists have theorized that multicellular life forms evolved as much as a billion years ago, the first multicellular life forms found in the fossil record lived about 600 million years ago.
(the first multicellular life forms; found; L:in the fossil record) (the first multicellular life forms found in the fossil record; lived; T:about 600 million years ago) (some scientists; have theorized; that multicellular life forms evolved as much as a billion years ago) Context(some scientists have theorized,List([9, 39))):(multicellular life forms; evolved as much; T:as a billion years ago)
some scientists have theorized,List([9, 39))
the first multicellular life forms the first multicellular life forms found in the fossil record some scientists multicellular life forms
found lived have theorized evolved as much
L:in the fossil record
T:about 600 million years ago
that multicellular life forms evolved as much as a billion years ago
T:as a billion years ago