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Animals
Biological Evolution
1
Egg morphology
1
Embryoparity/zygoparity
1
Female
1
Fishes
1
Male
Ovary
1
Ovum
1
Reproduction
1
Spermatozeugma
1
Spermatozoa
1
Testis
1
Testis types
1
Viviparity, Nonmammalian
1
Zona pellucida
1
animal
1
article
1
cytology
1
evolution
1
female
1
fish
1
histology
male
1
oocyte
1
ovary
1
physiology
reproduction
spermatozoon
1
testis
1
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1JOUR