how does DNA play a role in determining the structure of the proteins that regulate muscle contraction?​

Icant be totally sure but i would say with confidence that it is example #1 about cells.

You should provide a picture to show where the arrow is pointing and which information that is given. but there are 3 branches of the government, legislative, executive, and judicial. legislative makes laws, executives pass laws, and judicial are the courts

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord.