Earth & Environmental Sciences
contraction
67%
egg
68%
eggshell
64%
embryo
24%
experiment
9%
gas exchange
27%
hatching
84%
incompatibility
29%
incubation
19%
lizard
83%
loss
12%
mammal
20%
membrane
16%
reptile
26%
vertebrate
21%
viviparity
40%
Agriculture & Biology
allantois
22%
amnion
100%
breathing
12%
chorioallantoic membrane
18%
chorion
17%
egg shell
30%
eggs
16%
embryo (animal)
10%
gas exchange
13%
hatching
58%
lizards
67%
mammals
10%
oviposition
12%
reptiles
14%
Squamata
16%
Varanus
21%
vertebrates
10%
vivipary (animals)
20%
Medicine & Life Sciences
Allantois
23%
Amnion
87%
Chorioallantoic Membrane
19%
Chorion
19%
Egg Shell
43%
Embryonic Structures
11%
Gases
12%
Lizards
97%
Mammals
12%
Ovum
43%
Reptiles
19%
Respiration
11%
Vertebrates
12%