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6- The higher the concentration of the toxin ,……………………..is the
lethal time.
7- The impact of a toxin varies from one species to the other , but
even
among the same
species it may have
different
…………..depending
on
…………………….,
……………………..
and
…………………state.
8- Organisms subjected to low concentration of toxins may respond
in
different
ways
either
by
developing
………………………abnormalities
,
skeletal
……………………..,
physiological………………… or certain types of……………………….
9- Human sewage contains………………………………….that can infest
coastal ………………………and affect humans in contact with this
water.
10Pathogenic
bacteria
…………………in seawater
and can
affect
sea bathers ,………………………cuts and cause
some
dangerous diseases while …………………………….this contaminated
water.
11Bivalves
can
accumulate
…………………….from
sewage
contaminated water , in order to make them safe to eat they are
transferred
to
…………………………water
for……………………before
marketing.
12Some marine organisms
produce …………………….that are
transferred to humans while feeding on fish exposed to these
………………….., even if the fish is cooked …………………………..is not
destroyed .
13The discharge of large amounts of nutrients in water can
cause………………….
14In order to reduce the damaging effects of human sewage
in the different water bodies …………………………….facilities are
created
,
where
………………………………reduce
the
………………………content of the waste.
15BOD refers to ……………………………………which means
the
amount
of ………………………………….needed by microbes to
………………………organic material present in a water body.