The yellow cedar a tree species that is common in northwestern North America has been declining since 1880. Both the professor and passage talks about the reasons for declining. The former was not convinced about the reasons for decline while the lateral emphasizes the explanation of decline.
The first point of the discussion revolves around the decline of trees due to insect parasites called cedar bark beetle. The lecturer cast doubt on this theory. He explains that healthy trees are more resistant to insect, their bark, leaves are saturated which have a poisonous chemical which can kill the insect. So the healthy trees are not affected by insects and those trees are affected which already damage which was going to die anyway. So the insect parasites called cedar bark beetle is not the cause for decline. However, the article claims that insects called cedar bark beetle eat these trees and kills the yellow cedar.
Moreover, another topic of debate is declining is due to the brown bear. Once again the speaker was not agreed about the cause for declining. He says that bears can affect some trees but not all. These trees population is declining all over from northwest and even on the island too, and on the island, there was no bear. So bear could not be the reasons for the decline. On the other hand, the article mention that bears eat these trees as it contains high sugar like berries which is the main diet for them.
Last but not list, we reach the final argument about the change of weather is the cause. The professor says that many trees die even if the temperature is warm so the weather is not the reason for the decline. Nevertheless, the passage highlight that climate change has affected the root system of yellow cedar trees.
The yellow
cedar
a
tree
species
that is
common in northwestern North America has been
declining
since 1880. Both the professor and passage talks about the
reasons
for
declining
. The former was not convinced about the
reasons
for
decline
while the lateral emphasizes the explanation of decline.
The
first
point of the discussion revolves around the
decline
of
trees
due to
insect
parasites called
cedar
bark
beetle.
The
lecturer cast doubt on this theory. He
explains
that healthy
trees
are more resistant to
insect
, their
bark
,
leaves
are saturated
which have a poisonous chemical which can kill the
insect
.
So
the healthy
trees
are not
affected
by
insects
and those
trees
are
affected
which already damage which was going to
die
anyway.
So
the
insect
parasites called
cedar
bark
beetle is not the cause for
decline
.
However
, the article claims that
insects
called
cedar
bark
beetle eat these
trees
and kills the yellow cedar.
Moreover
, another topic of debate is
declining
is due to the brown
bear
. Once again the speaker was not
agreed
about the cause for
declining
. He says that
bears
can affect
some
trees
but
not all. These
trees
population is
declining
all over from northwest and even on the island too, and on the island, there was no
bear
.
So
bear
could not be the
reasons
for the
decline
.
On the other hand
, the article mention that
bears
eat these
trees
as it contains high sugar like berries which is the main diet for them.
Last
but
not list, we reach the final argument about the
change
of weather is the cause. The professor says that
many
trees
die
even if the temperature is warm
so
the weather is not the
reason
for the
decline
.
Nevertheless
, the passage highlight that climate
change
has
affected
the root system of yellow
cedar
trees
.