95
organisms vary widely in their ………………….to the presence of
these substances in water . In low concentration some of the
marine organisms ……………………….these metals in their synthesis
of biologically important molecules
. They can …………………the
metal……………………..in
their
bodies
thanks
to
some
…………………..processes.
2- Organisms that are …………………to metal pollution , tend to avoid
highly ………………………………..habitats . If they can not the metals
will …………………….in their
bodies and i twill not be
………………………. , this process is called……………………
3- Biomagnification is ……………………….of metals in greater amounts
in
each
step
of
the
food
……………….Top
predators
contain………………………heavy
metals
than
…………………….consumers.
4- Concentration of the metals in the body of organisms is measured
by …………….or …………………. , either on the basis of……………….,
……………., or …………………..weight.
5- ……………………………..is when the tissues are removed from the
body.
6- ………………………………is the weight after being ……………………of free
water.
7- …………………………..is the weight after drying at ……………………..and
unbound water is…………………..
8- In order to get the …………………….concentration of a metal in the
body of marine organisms , one must rely on ……………….weight.
9- Metals reach the marine environment through different means ,
the type of deposition varies and depends on the way the metal
is exchanged between the atmosphere and the marine
environment ;
- ………………………………occurs at the surface of the sea.
- ……………………..refers at the fallout of particles.
- ……………………occurs through precipitation.
10Contaminants
are
continually
exchanged
between
…………………..and ………………..