The mesoderm, or middle layer of the embryo, develops into various vital systems and tissues in the body.
The middle layer of the embryo, known as the mesoderm, will develop into the circulatory system, bones, muscles, excretory system, and reproductive system. This layer gives rise to most of the muscle and connective tissues, including the heart, blood, bones, muscles, and kidneys.
https://brainly.com/question/33280136