The passage and the lecture both discuss the reason of quickly declining in the numbers of sea otters in that has a significant effect on region's costal ecosystem. Both explain two dominated explanation about decrease in population of them, environmental pollution and predators. The passage claim that the pollution explain this event more convincingly in comparison to attack by predators and give three reason for this. Even though, the lecture denies all those reason and states that the reason of attacking by predators is more conceivable.
First, according to passage, existence of industrial chemical materials like oil rigs along the Alaskan cost, is an important evidence for declining of this kind of animal by pollution of industrial factories. In contrast, the lecture denies this assertion by stating that there were not any dead sea otters along this coast, so it is not possible pollution caused death of this animal. While declining in population of this animal without any evidences of their dead bodies can be explained more conceivable.
Second, the reading points out that pollution explanation is more likely true because of death some other mammals like seals and sea lions. It can be explained by universally pollution effects on the entire ecosystem. But, the lecture state that orcas changed their diet from whale to small mammals because of decreasing the numbers of whale causing by human hunter. So, they ate small mammals like seals and sea lions besides sea otters in order to survive.
Third, the reading says that irregular pattern of declining them could happen by environmental factors like ocean currents. By contrast, the lecture contends that this uneven pattern can be justified better by large size of orcas. In fact, they weren’t able to pass thorough shallow water and rocky place because of their large size. As the shallow water and rocky place are the location with stable sea otters' population, considering reason of decrease in the number of sea otter is more reasonable and conceivable.
The passage and the
lecture
both discuss the
reason
of
quickly
declining
in the numbers of
sea
otters in that has a significant effect on region's
costal
ecosystem. Both
explain
two dominated explanation about decrease in population of them, environmental
pollution
and predators. The passage claim that the
pollution
explain
this
event
more
convincingly
in comparison
to attack by predators and give three
reason
for this.
Even though
, the
lecture
denies all those
reason
and states that the
reason
of attacking by predators is more conceivable.
First
, according to passage, existence of industrial chemical materials like oil rigs along the Alaskan cost, is an
important
evidence for
declining
of this kind of animal by
pollution
of industrial factories.
In contrast
, the
lecture
denies this assertion by stating that there were not any dead
sea
otters along this coast,
so
it is not possible
pollution
caused death of this animal.
While
declining
in population of this animal without any evidences of their dead bodies can be
explained
more conceivable.
Second, the reading points out that
pollution
explanation is more likely true
because
of death
some
other mammals like seals and
sea
lions. It can be
explained
by
universally
pollution
effects on the entire ecosystem.
But
, the
lecture
state that orcas
changed
their diet from whale to
small
mammals
because
of decreasing the numbers of whale causing by human hunter.
So
, they ate
small
mammals like seals and
sea
lions
besides
sea
otters in order to survive.
Third, the reading says that irregular pattern of
declining
them could happen by environmental factors like ocean currents. By contrast, the
lecture
contends that this uneven pattern can
be justified
better by large size of orcas. In fact, they weren’t able to pass thorough shallow water and rocky place
because
of their large size. As the shallow water and rocky place are the location with stable
sea
otters' population, considering
reason
of decrease in the number of
sea
otter is more reasonable and conceivable.