Trai sông lớp 7

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Câu hỏi:
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Đầu vỏ
Đỉnh vỏ
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Đuôi
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Vòng tăng trưởng vỏ

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Lớp đá vôi
Lớp xà cừ
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Sản phẩm từ lớp vỏ xà cừ

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Trả lời: W :Z( 

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5KL.5MN-;O/D
-*F%$1<$
D7 ZY:(%
  a  0 k
`>!
*l 

Ống
hút
nước
Ống thoát nước
Hướng di chuyển
+,Q(=(1m
4a:_)
P V c ( %
 `:Z(_

,C./DE/F5FG/@H@
5KL.5MN-;O/D
-*F%$1<$
*l 
+,Q(=(1m
4a:_)
P V c ( %
 `:Z(_
Câu hỏi: 5( "I %
 ((e
(  k  < (
"I(% (
578.5(% 
$:0_
#[n+\no

,C./DE/F5FG/@H@
5KL.5MN-;O/D
-*F%$1<$
*l 

+,Q(=(1m
4a:_)
P V c ( %
 `:Z(_
*l%p

Oxi
Nước
(Thức ăn, oxi)
Thức
ăn
Chất
thải
Ống hút
Ống thoát
Mang
Lỗ miệng
Cacbonic
Tấm
miệng
+q3I<:'((%r(PQ
+l=_k#Y4(3(
k
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6s'((8
+)gd`4 %%p'((
,QV.
+q386s'((%r(PQ

,C./DE/F5FG/@H@

5KL.5MN-;O/D
-*F%$1<$
*l 
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 4 a: _ )
PVc(% 
`:Z(_
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,Q K. l= _ k #
Y4(3(k
 <   &
((
+56s.e!
"m*
578.56sIg
+56s'((8

,C./DE/F5FG/@H@
5KL.5MN-;O/D
-*F%$1<$
*l 
+ ,Q ( = (1 m
 4 a: _ )
PVc(% 
`:Z(_
*l%p
+56s.e!
"m*
,Q [. q3  8 6
s '( ( "I %r ( P

Q
578.%r($8j&
'(38I
!<&
fj
&

,C./DE/F5FG/@H@
5KL.5MN-;O/D
-*F%$1<$
*l 
+ ,Q ( = (1 m
 4 a: _ )
PVc(% 
`:Z(_
*l%p
+56s.e!
"m*
+ l %p 4  m

,Q\.)gd
` 4  % %p '(
(

,C./DE/F5FG/@H@
5KL.5MN-;O/D
-*F%$1<$
*l 
+ ,Q ( = (1 m 
4a:_)PVc

(% `:Z(_
*l%p
+56s.e!
"m*
+ l %p 4  m

+q3I<:%r(P
(
,QC.q3I<:
'((%r(PQ
5$ "( `   _
 (  7 (
   8 _ t8 
_u
7Z
5<
&