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Scie
nce
(Wee
k 20
, Day
s 1–
3)Ch
icke
n lif
e cy
cle
sequ
enci
ng c
ards
Patr
ik N
ygre
n/fli
ckr/
(CC
BY-S
A 2
.0)
Mic
hael
Sal
e/fli
ckr/
(CC
BY-N
C 2.
0)
Ale
x St
ar/fl
ickr
/(CC
BY-
SA 2
.0)