56
20-Soft-bottom communities are found in……………………
21-The Macoma community dwells in…………
22-The Venus community dwells in ……………..
23-Life in the open-ocean or in its bottom is……………..because the
open ocean is located ………………………
24-There are no seaweeds in the ocean except ………………………..
25-Phytoplankton in the open ocean include…………………
26-Examples of herbivorous zooplankton in the open ocean we have
………………….
27-Prawns , shrimps , copepods , squids …… are found in…………….
28-Food
in
the
dysphotic
and
Aphotic
zone
is……………because……………………………animals
that
live
here
rely on ……………..for food
29-Some animals swim upward to the photic zone at night to feed , this
type of migration is called…………………….
30-Fish species that live in the aphotic zone are called…………………
31-Many invertebrates and fishes that live in the dark , deep aphotic
zone
possess
……………to
attract
.potentiel
preys
or
……………….themeselves to one another.
32-----The biota of the deep-sea bottom reproduce ……………………,
because tehre are no ………………….., they grow ………………and
live ……….than the fauna of shallow waters , the near-freezing
temperature reduce the rate of…………………………….
33-The stability of the physical and chemical aspects of deep-sea bottom
………………………………..of the deep-sea communities.
34-When
an
animal
has
no
natural
predators
,
it
will
…………………other species
for……………………… this will lead
to…………………….of many species and ………..biological diversity.
This situation is referred to as………………..