Both the reading passage and lecturer is talking about theories relating to extinction of dinosaurs. The passage states three important theories that clarifies causes of their extinction. However, the lecturer tries to refutes them all by providing well explained proofs.
First, the passage states asteroids were responsible for their extinction. It explains how availability of Iridium in Earth's surface is relatable to their extinction. It is theorized that, as Iridium is less available in earth and highly available in meteorites, there was meteor shower during the age of dinosaur. Which eventually, extinctic them. On the contrary, the lecturer claims that these Iridium were available on earth's crust because of volcanic ashes. These ashes transferred Iridium from lower earth crust. So, the asteroid theory is not convenient.
Second, the passage explains how low temperature and extreme climatic condition during ice age might have aided in extinction of dinosaurs. It states that becuse of poor thermoregulatory system of dinosaur their habitat and daily activities were influence which aided in their extinctin. But, the lectures debukes it by saying there was no any fossil evidience available to support this. Instead, fossilized evidiences proved that the climate during that period was tropical. The seal level was higher at that period and also most foosils dated to that period were of tropical plants which supports the point of the lecturer.
Finally, the passage states that evolution of dinosaur into bird caused their extinction. The passage proves it by stating how compareable were their body structures, complexicity and vita organs. But, the lecturer argues it by stating their body size were not compareable to support evolution. In addition, their mobility were also different. Dinosours had few range for their movement but, since birds could fly they were able move long distance and suvive harsh condition in an area by moving to other. This uncompromisingly proves that dinosurs didn't evolve into birds.
Both the reading
passage
and
lecturer
is talking about theories relating to
extinction
of dinosaurs. The
passage
states
three
important
theories that clarifies causes of their
extinction
.
However
, the
lecturer
tries to
refutes
them all by providing well
explained
proofs.
First
, the
passage
states
asteroids were responsible for their
extinction
. It
explains
how availability of Iridium in Earth's surface is relatable to their
extinction
. It
is theorized
that, as Iridium is less
available
in earth and
highly
available
in meteorites, there was meteor shower during the age of
dinosaur
. Which
eventually
,
extinctic
them.
On the contrary
, the
lecturer
claims that
these Iridium
were
available
on earth's crust
because
of volcanic ashes. These ashes transferred Iridium from lower earth crust.
So
, the asteroid theory is not convenient.
Second, the
passage
explains
how low temperature and extreme climatic condition during ice age might have aided in
extinction
of dinosaurs. It
states
that
becuse
of poor
thermoregulatory
system of
dinosaur
their habitat and daily activities were influence which aided in their
extinctin
.
But
, the lectures
debukes
it by saying there was
no
any fossil
evidience
available
to support this.
Instead
, fossilized
evidiences
proved that the climate during that period was tropical. The seal level was higher at that period and
also
most
foosils
dated to that period were of tropical plants which supports the point of the lecturer.
Finally
, the
passage
states
that evolution of
dinosaur
into bird caused their
extinction
. The
passage
proves it by stating how
compareable
were their body structures,
complexicity
and vita organs.
But
, the
lecturer
argues it by stating their body size were not
compareable
to support evolution.
In addition
, their mobility were
also
different
.
Dinosours
had
few range
for their movement
but
, since birds could
fly
they were able
move
long distance and
suvive
harsh condition in an area by moving to other. This
uncompromisingly
proves that
dinosurs
didn't evolve into birds.