In human embryos, most development and differentiation of tissues and organs is complete by_______________ after fertilization.
A) eight days
B) three weeks
C) six weeks
D) three months

Name: In human embryos, most development and differentiation of tissues and organs is complete by_______________ after fertilization. A) eight days B) three weeks C) six weeks D) three months
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By three months after fertilization, most of the major organs and tissues have developed and differentiated in the human embryo.

In Human Embryos, Most Development and Differentiation of Tissues and Organs