Final answer:
In the developing embryo, the mesoderm germ layer would form the blood, among other structures such as the heart and muscles. The correct answer to the original question is B. Blood. The skin, hair, brain, and lens of the eye are not formed from the mesoderm.
Step-by-step explanation:
In the developing embryo, the structures that would be formed from the mesoderm germ layer include the skeleton, muscles, connective tissue, heart, blood vessels, and kidneys. Therefore, among the options provided, the one that is correct is B. Blood. The ectoderm is responsible for the formation of the central and peripheral nervous systems, sensory organs, epidermis, hair, and nails. The endoderm will develop into internal structures like the lining of the gastrointestinal tract, liver, and pancreas, among others.
Additionally, in response to the true or false question, the nervous system is developed from the ectoderm, the same germ layer from which skin cells (epidermis) develop, making the statement True.
- Formation of blood from the mesoderm
- Ectoderm gives rise to skin and nervous system
- Endoderm forms internal organ linings