In this set of materials, the reading states that the invation of zebra mussel cannot be stopped and they have real danger for freshwater fish in all of North America and brings up three different hyptheses to explain the undangerousness of zebra mussel. However, the lecture finds all the ideas incorrect and he believes there are some way to control zebra mussels and in it is possible if we use effective ways and he provides some evidence to support his claim.
First of all, the author of the passage claims that the zebra mussels attach theirslf to ship's bottom and use ballast water to migrate to North America. In contrast, the lecture argues that people can empty the ballast water out of the ocean when they arrive to the beach rather then pour them in the ocean.
Furthermore, it is mentioned in the reading passage that they can confront against any difficulties in the new habitats and become dominat because they have good reproduction and there is no predators to kill zebra mussels. On the contrary, the lecture contends that the zebra mussel has not any predators only in the begining, but the habitat changes over time and some animals eat zebra mussels now.
Finally, the author is of the opinion that the zebra mussel causes the decrease in the number of fishs because they eat fish's foods. Conversly, the lecture explains that the zebra mussels have negative effect only on some fishes, but they have positive influence on other fishes which nutrient from the traces of the zebra mussels.
In this set of materials, the reading states that the
invation
of zebra
mussel
cannot be
stopped and
they have real
danger
for freshwater fish in all of North America and brings up three
different
hyptheses
to
explain
the
undangerousness
of zebra
mussel
.
However
, the
lecture
finds all the
ideas
incorrect and
he believes there are
some
way to control zebra
mussels
and in it is possible if we
use
effective
ways and
he provides
some
evidence to support his claim.
First of all
, the author of the passage claims that the zebra
mussels
attach
theirslf
to ship's bottom and
use
ballast water to migrate to North America.
In contrast
, the
lecture
argues that
people
can empty the ballast water out of the ocean when they arrive to the beach
rather
then
pour them in the ocean.
Furthermore
, it
is mentioned
in the reading passage that they can confront against any difficulties in the new habitats and become
dominat
because
they have
good
reproduction and
there is no predators
to kill zebra
mussels
.
On the contrary
, the
lecture
contends that the zebra
mussel
has not any predators
only
in the
begining
,
but
the habitat
changes
over time and
some
animals eat zebra
mussels
now
.
Finally
, the author is of the opinion that the zebra
mussel
causes the decrease in the number of
fishs
because
they eat fish's foods.
Conversly
, the
lecture
explains
that the zebra
mussels
have
negative
effect
only
on
some
fishes,
but
they have
positive
influence on other fishes which nutrient from the traces of the zebra
mussels
.