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B
Heart, Spleen, Gonad
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C
Pineal body, Stomodeum, Proctodaeum
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D
Nervous system, Epidermis, Internal ear
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Solution
The correct option is B Heart, Spleen, Gonad Gastrulation leads to organogenesis (organ formation) in which the cells of the three germ layers continue the processes of pattern formation, that lead to the formation of specific structures. The ectoderm eventually forms the outer layer of the skin and gives rise to the nervous system and sense organs.
Tissues that eventually line the digestive tract, and organs that develop as outgrowths of the digestive tract (including the liver, pancreas, and lungs), are all of the endodermal origin. Skeletal tissue, muscle, and the circulatory (for example, heart, spleen etc), excretory, and reproductive systems (for example, gonads) all are derived from mesoderm.