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2. DINOSOURS
They first appeared during the
Triassic geologic period, between 243
and 233.23 million years ago,
although the exact origin and timing of
dinosaur evolution is a subject of
ongoing research. They became the
dominant land vertebrates 201.3
million years ago and their dominance
continued throughout the Jurassic and
Cretaceous periods. The fossil record
shows that birds are modern
feathered dinosaurs, which evolved
from earlier theropods during the Late
Jurassic. As such, birds were the only
dinosaur lineage to survive extinction
in the Cretaceous-Paleogene
extinction event about 66 million years
ago. Therefore, dinosaurs can be
divided into avian dinosaurs and non-
avian dinosaurs.

3. WHY DID THE DINOSAURS DISAPPEAR?
Dinosaurs were on the verge of
extinction even before the terrible
asteroid hit the Earth, 66 million years
ago - writes the Guardian.Dinosaurs
first appeared about 230 million years
ago, and new species appeared much
more often than old ones died out.The
research carried out by scientists from
the University of Bristol and Reading,
shows that all this began to change and
threaten the survival of these animals,
long before the asteroid hit the Earth
and ended their existence forever.

4. CLASSIFICATION
Dinosaurs belong to a group known as archosaurs, which
includes modern crocodiles. Within the archosaur group,
dinosaurs differ most notably in their gait. The legs of
dinosaurs extend directly under the body, while the legs of
lizards and crocodiles extend to either side.Collectively,
dinosaurs are divided into two primary branches,
Saurischia and Ornithischia. The former include taxa that
share a more recent common ancestor with birds than with
Ornithischia, while Ornithischia includes all taxa that share
a more recent common ancestor with Triceratops than with
Saurischia. Anatomically, these two groups can be
distinguished most notably by their pelvic structure. Early
sauropods retained the hip structure of their ancestors,
with the groin bone pointing cranially or forward. This
basic shape was modified by turning the groin backwards
to varying degrees in several groups (Herrerasaurus,
Therizinosaurus). Saurischia includes theropods
(exclusively bipedal) and sauropodomorphs (long-necked
herbivores, which include quadrupedal groups)In contrast,
Ornithischia - "birds", had a pelvis that superficially
resembles a bird's pelvis: the groin was oriented towards the
tail (backwards). Unlike birds, this bone usually had an
additional forward-directing process. Ornithischia includes
various species that were primarily herbivores. Despite the
terms "bird-hipped" and "lizard-hipped", birds are not part
of Ornithischia, but of Saurischia - birds evolved from
earlier "lizard-hipped" dinosaurs