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