Gonads develop from embryonic:

Explanation

Gonads, which are the primary reproductive organs in humans and other animals, develop from the embryonic tissue known as the mesoderm. Let's go through each option and explain why: a. Ectoderm: The ectoderm is one of the three primary germ layers in the developing embryo. It gives rise to tissues such as the skin, nervous system, and sensory organs. While some structures related to reproduction, like the genitalia, may develop from the ectoderm indirectly, the gonads themselves do not originate from the ectoderm. b. Endoderm: The endoderm is another of the three primary germ layers. It gives rise to the lining of the digestive and respiratory tracts, as well as some internal organs like the liver and pancreas. It is not involved in the development of the gonads. c. Mesoderm: The mesoderm is the germ layer responsible for the development of various structures, including the gonads. In the embryo, the gonadal ridge forms from the mesoderm, which eventually differentiates into either testes (in males) or ovaries (in females). Summary: Gonads develop from the embryonic mesoderm. The other germ layers, ectoderm and endoderm, do not directly contribute to the formation of gonads. Therefore, the correct answer is option c, "Mesoderm."