NOTOCHORD
TAIL
GASTRULA
BLASTULA
COELOM
PLACENTA
HORION
VIVIPAROUS
A
Q
E
W
O
I
B
A
A
L
U
L
U
T
J
B
T
U
L
C
M
J
U
C
A
N
O
H
U
O
I
X
J
R
E
I
O
A
T
E
T
H
O
C
T
R
L
R
S
L
I
Q
A
G
I
S
J
C
A
O
U
L
U
O
Q
C
A
C
L
M
P
B
N
I
Z
I
X
G
B
A
V
I
V
I
P
A
R
O
U
S
C
D
R
O
H
C
O
T
O
N
