The reading passage contends that dinosaurs must have possessed feathers like modern birds, and provides several evidences that seem to uphold its claim. However, the lecture points out that not all proof indicate as mentioned in the reading passage and provides several advocating reasons. The evidences mentioned in the lecture will be elaborated in more detail below.
First of all, the lecture refutes the point made in the reading passage, which asserts that dinosaurs possessed feathers that are a defining trait of their descendants, by mentioning that modern birds have been evolved from specfic types of groups of dinosaurs. Also, evidences show that not all descendants possess feathers like the modern birds, which have been inherited from Therapods. This proves that not all dinosaurs had feathers.
Second, while the reading passage contends that there exists physical evidence that indicates that some dinosaurs definitely had feathers, the lecture disapproves this point by commenting that many fossils that contain skin impressions are not feathers. Actually, multiple skin samples indicate that the dinosaurs had different types of skins other than having feathers, such as being bumpy or either having scales or plates.
Last but not least, the reading passage claims that the dinosaurs must have had feathers in a way of regulating temperature. While the lecture agrees that this may be true, it also mentions that this is not applicable to larger dinosaurs who are referred to as gigantothermy. Because of their immense size, their internal temperature changes in a very slow rate, eliminating the need for feathers to regulate their body temperature and provides an example of sea turtles as proof. Moreover, for those who rely on Sun for heat, feathers would have actually blocked the sunlight, making it extremely unhelpful in regulating temperature.
The
reading
passage
contends that dinosaurs
must
have possessed
feathers
like modern birds, and provides several
evidences
that seem to uphold its claim.
However
, the
lecture
points out that not all proof indicate as mentioned in the
reading
passage
and provides several advocating reasons. The
evidences
mentioned in the
lecture
will
be elaborated
in more detail below.
First of all
, the
lecture
refutes the point made in the
reading
passage
, which asserts that dinosaurs possessed
feathers
that are a defining trait of their descendants, by mentioning that modern birds have
been evolved
from
specfic
types of groups of dinosaurs.
Also
,
evidences
show
that not all descendants possess
feathers
like the modern birds, which have
been inherited
from
Therapods
. This proves that not all dinosaurs had feathers.
Second, while the
reading
passage
contends that there exists physical
evidence
that indicates that
some
dinosaurs definitely had
feathers
, the
lecture
disapproves this point by commenting that
many
fossils that contain skin impressions are not
feathers
. Actually, multiple skin samples indicate that the dinosaurs had
different
types of skins other than having
feathers
, such as being bumpy or either having scales or plates.
Last
but
not least, the
reading
passage
claims that the dinosaurs
must
have had
feathers
in a way of regulating
temperature
. While the
lecture
agrees
that this may be true, it
also
mentions that this is not applicable to larger dinosaurs who
are referred
to as
gigantothermy
.
Because
of their immense size, their internal
temperature
changes
in a
very
slow rate, eliminating the need for
feathers
to regulate their body
temperature
and provides an example of sea turtles as proof.
Moreover
, for those who rely on Sun for heat,
feathers
would have actually blocked the sunlight, making it
extremely
unhelpful in regulating
temperature
.