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All the layer such as zona …

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All the layer such as zona pellucida and etc they are cell membrane or different thing i am very confused when i heard about layer of cell.what means layer of cell
  • 1 answers

Meghna Thapar 5 years ago

The germ layers represent some of the first lineage-specific (multipotent) stem cells (e.g., cells destined to contribute to specific types of tissue, such as muscle or blood) in embryonic development. Hence, each germ layer eventually gives rise to certain tissue types in the body. A germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues. The major internal organs and external features begin to emerge, forming an embryo. In this stage, the heart, brain, and spinal cord become visible. Arms and legs start to develop. Fetal stage: Once the formed features of the embryo begin to grow and develop, the organism is considered a fetus.

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