Final answer:
The midline mesoderm differentiates into somites contributing to the formation of skeletal structures, muscles, connective tissue, the heart, blood vessels, and kidneys.
Step-by-step explanation:
The midline mesoderm differentiates into a variety of structures within the vertebrate embryo. It undergoes organization into segments called somites, which give rise to the skeletal muscles, vertebrae, ribs, and dermis of the dorsal skin. The midline mesoderm also contributes to the formation of the notochord, a rod-shaped structure that serves as the central axis of the animal body. Additionally, mesodermal cells ultimately become components such as the skeleton, muscles, connective tissue, heart, blood vessels, and kidneys.