Examlex
Galileo had made improvements on the lens developed by the Dutch for use in telescopes,but some of the earliest work on the nature of how humans see was done by:
Gastrulation
An early embryonic phase in animal development during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.
Morula Stage
An early stage in embryonic development characterized by a solid ball of cells resulting from the division of a fertilized egg.
Human Embryo
A human embryo is an early stage of human development, following fertilization and preceding the fetal stage, during which all major organs and structures begin to form.
Chorion
The outermost membrane surrounding an embryo of a reptile, bird, or mammal (in humans, it contributes to the formation of the placenta).
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