Ecology
is
the
study
of
ecosystems
.
Ecosystems
are
said
to
be
in
____________________
____________________
when
the
flow
of
matter
energy
between
biotic
an
abiotic
factors
is
continuous
.
Ecosystems
change
over
time
through
a
process
called
ecological
____________________
.
During
this
process
,
both
the
biotic
and
abiotic
factors
chance
.
Ecological
succession
is
____________________
and
takes
a
long
time
to
happen
,
but
sometimes
ecosystems
experience
____________________
that
accelerate
the
process
.
Diturbances
affecting
ecosystems
can
be
caused
by
natural
____________________
or
by
human
actions
.
Volcanic
eruptions
and
tornadoes
are
natural
____________________
.
Overfishing
and
global
warming
are
human
____________________
.
