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An embryo is what an organism is in its first stage of development after conception. The first tissues to form are the ectoderm, mesoderm, and endoderm.

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Q: What structures is the first sign of a human body forming during the embryonic period?
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During which prenatal period are the placenta and umbilical chord formed?

embryonic period


What happens during the embryonic period of pregnancy?

The embryonic period are the first eight weeks of development of the child, beginning with fertilization. During this period, the embryo undergoes an amazing transformation from a single cell to a recognizably human embryo. In the mid-twentieth century, George Streeter devised a commonly used embryo classification system by dividing the embryonic period into 23 stages. The embryonic period is followed by the fetal period, which encompasses the remainder of theprenatal development.


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During which geologic time period did the earliest coal-forming forests exist?

During the Pennslyvanian and Mississippian Eras


The gradual modification of body structures during the period from conception to maturity is?

development


What is the developing baby called during the first trimester?

The embryonic period extends to the end of the eight week. After the embryonic period (8weeks), the developing human is called a fetus.


What time period does the embryonic stage of gestation covers?

How long is the embryonic period in humans?


The resumption of growth after a period of arrested embryonic development is?

germination


During which geologic time period did the earliest reptiles and great coal-forming forests exist?

pennsylvanian.


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embryonic.


What period of human development are cells changing?

Embryonic phase is the period of human development. This is when the cells change.


Is embryonic stage and the first trimester the same?

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