Be sure they know that Charles Darwin visited the islands in 1835 and studied the animal life there.
(Charles Darwin; studied; the animal life there) (they; know; that Charles Darwin visited the islands in 1835 and studied the animal life there) Context(they know,List([8, 17))):(Charles Darwin; visited; the islands; T:in 1835)
they know,List([8, 17))
Charles Darwin they Charles Darwin
studied know visited
the animal life there
that Charles Darwin visited the islands in 1835 and studied the animal life there
the islands T:in 1835