Just answer the one that isn’t answered here’s a photo..

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).