EVIDENCE In trying to understand the origins of bats, researchers can study living animals, but nobody was around millions of years ago to observe the formation of bats, so they have to rely on fossils to supply the evidence of what they propose.
(they; propose; ) (they; to rely; on fossils; to supply the evidence of what they propose) Context(they to rely,List([173, 190))):(they; to rely on fossils to supply; the evidence of what they propose) (nobody; was; around millions of years; T:ago; to observe the formation of bats)
they to rely,List([173, 190))
they they they nobody
propose to rely to rely on fossils to supply was
on fossils to supply the evidence of what they propose
the evidence of what they propose
around millions of years T:ago to observe the formation of bats