Sperm cells (1800x) • Egg cell (ovum)-fertilization (200x) • Fertilized egg-(zygote) (200x) • Two-celled embryo-first cleavage (200x) • Chromosomes-Squash (400x) • Ball of cells (200x) • Blastula-hollow ball of cells (200x) • Embryo-five weeks (3x)
|Country Of Origin
||United States of America
Two-celled embryo-first cleavage,
Double-sided study cards of fossils with diagram, characteristics and location.
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