The material discusses if the fossil of T. rex dinosaur still had a remaining of actual tissues or not. While the reading mentions that when the researchers broke T. rex's leg bone found that it still contains blood vessels, red blood cells, and collagen matrix. However, the listening challenges all the points outlined in the reading passage.
First, the author states that the breaking fossil's leg has branching channels that probably where blood vessels were located, in addition to that it has soft materials which the remaining of actual blood vessels. On the contrary, the professor opposes this and points out that the branching channels could be something else, not blood vessels. The lecturer explains that after a long time of animal die, bacteria colonize an animal's bones and leaves traces behind. according to the lecture, the soft materials that were found inside the bone are just traces of organic materials that left from bacteria.
Second, the writer cites that the microscopic examination of the fossil's bone reveals that it has spheres that could be the remains of red blood cells. On the other hand, the lecturer refutes that and contends that researchers found identical spheres in other animals at the same place. The professor adds that some of these animals were primitive and did not have blood vessels. The speaker concludes that if these spheres found in animals that did not have blood vessels, so they could not represent blood vessels. The professor suggests that these spheres could be reddish minerals.
Third, the reading states that the dinosaur's leg bone still had a collagen matrix. Conversely, the lecturer contradicts this and posits that collagen could last for a hundred- thousand years, but T. rex fossil is seventy million years old. Thus, finding collagen in the fossil's leg contradicts how the collagen could last. Furthermore, the lecturer explains that collagen could come from a much recent source. He states that human skin has collagen, so the collagen in the fossil might come from the researchers' skin who handled the bone.
The
material
discusses if the fossil of T.
rex
dinosaur
still
had a remaining of actual tissues or not. While the reading mentions that when the researchers broke T.
rex
's
leg
bone
found
that it
still
contains
blood
vessels
, red
blood
cells, and collagen matrix.
However
, the listening challenges all the points outlined in the reading passage.
First
, the author states that the breaking fossil's
leg
has branching channels that
probably
where
blood
vessels
were located
,
in addition
to that it has soft
materials
which the remaining of actual
blood
vessels
.
On the contrary
, the professor opposes this and points out that the branching channels could be something else, not
blood
vessels
. The
lecturer
explains
that after a long time of
animal
die
, bacteria colonize an animal's
bones
and
leaves
traces behind.
according
to the lecture, the soft
materials
that were
found
inside the
bone
are
just
traces of organic
materials
that
left
from bacteria.
Second, the writer cites that the microscopic examination of the fossil's
bone
reveals that it has
spheres
that could be the remains of red
blood
cells.
On the other hand
, the
lecturer
refutes that and contends that researchers
found
identical
spheres
in other
animals
at the same place. The professor
adds
that
some
of these
animals
were primitive and did not have
blood
vessels
. The speaker concludes that if these
spheres
found
in
animals
that did not have
blood
vessels
,
so
they could not represent
blood
vessels
.
The
professor suggests that these
spheres
could be reddish minerals.
Third, the reading states that the dinosaur's
leg
bone
still
had a collagen matrix.
Conversely
, the
lecturer
contradicts this and posits that collagen could last for a hundred- thousand years,
but
T.
rex
fossil is seventy million years
old
.
Thus
, finding collagen in the fossil's
leg
contradicts how the collagen could last.
Furthermore
, the
lecturer
explains
that collagen could
come
from a much recent source. He states that human skin has collagen,
so
the collagen in the fossil might
come
from the researchers' skin who handled the
bone
.