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# Critical Period and Epigenesis This diagram outlines the different stages of human development, focusing on critical periods. **Stages:** * **Fertilization to Implantation:** This stage spans from fertilization to implantation and is characterized by cell division and differentiation. The diag...

# Critical Period and Epigenesis This diagram outlines the different stages of human development, focusing on critical periods. **Stages:** * **Fertilization to Implantation:** This stage spans from fertilization to implantation and is characterized by cell division and differentiation. The diagram shows a series of zygote development images, progressing from fertilization to 2 to 4 days. * **Embryonic Period:** Occurring from the third to the eighth week of development. The image displays an ultrasound image of a developing embryo. * **Fetal Period:** Following the embryonic period, from the eighth week to birth. Illustrations of developing fetuses in various stages of growth are provided. **Key Information:** The diagram visually presents the stages of human development with timeframes and illustrations to aid in comprehending the different processes. **Image Description:** The image is a flowchart showing the different stages of human development. It includes images of different fertilized eggs/embryos at different stages of development and timeframes for each stage. The flowchart also displays a grey diagram which visualizes the different stages in a more detailed manner. Grey boxes denote the different periods in the human development. The image is labelled with text, indicating the beginning and ending points for each stage with corresponding timeframes.