They are referred to as living fossils because they have the same shape as fossils of creatures that lived 4 million years ago.
(They; are referred; as living fossils; because they have the same shape as fossils of creatures) (they; have; the same shape as fossils of creatures) (creatures; lived; T:4 million years ago)
They they creatures
are referred have lived
as living fossils because they have the same shape as fossils of creatures
the same shape as fossils of creatures
T:4 million years ago