Last Updated：2025/12/30
Sentence
Sessile
organisms
are
those
which
are
sedentary
in
habit,
whether
attached
or
possessing
slight
powers
of
locomotion.
Motile
organisms
are
those
that
habitually
move
about.
Vagile
or
creeping
forms
as
well
as
swimming,
walking,
flying,
burrowing
types
are
included.
Most
sessile
animals
are
capable
of
moving
their
parts,
while
only
a
few
sessile
plants
possess
this
capacity,
and
these
only
to
a
slight
degree.
There
is
no
sharp
distinction
between
sessile
(sedentary)
and
motile
organisms.
Every
possible
gradation
exists
between
fixed
non-motile
types
as
trees
on
the
one
hand
and
the
pelagic
fishes
on
the
other.
Quizzes for review
Sessile organisms are those which are sedentary in habit, whether attached or possessing slight powers of locomotion. Motile organisms are those that habitually move about. Vagile or creeping forms as well as swimming, walking, flying, burrowing types are included. Most sessile animals are capable of moving their parts, while only a few sessile plants possess this capacity, and these only to a slight degree. There is no sharp distinction between sessile (sedentary) and motile organisms. Every possible gradation exists between fixed non-motile types as trees on the one hand and the pelagic fishes on the other.
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