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B7.1 ­ Living organisms are
interdependent.












Ani
ma l
s (
and humans)
can'
t
produce
thei
r
own
food.
Ther
efor
e,
w e
are
heterotrophs.

We r
ely
on ot
her
li
vi
ng
thi
n gs
to
produce
our
food
for
us.







As we humans can't make…

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Pyramids of Biomass and Numbers

Usi
ng a
pyrami d di
agram t
o descr
ibe
the
organi
sms i
n a
food
chai
n can
be
usef
ul
to
see
rel
ati
onsh i
p s.
Ther
e ar
e
two
types
of
these
pyr
amids:

1)
Pyramid of…

Page 3

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depends
on
the
ti
me
scal
e al
so
in
w hi
ch
the
mea sur
ement
s wer
e t
aken.

Some ani
mals
ma y
be eat
en
quicker
t
han
they
are
repr
oduci
ng
or
vice
versa.



Efficiency can be calculated to show the efficiency of…

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