2. Under what circumstances is a continuous spectrum formed? Under what circumstances is a line spectrum formed?

Continuous spectra (also called thermal or blackbody spectra) arise from dense gases or solid objects which radiate heat. They emit radiation over a broad range of wavelengths, thus the spectra appear smooth and continuous.i hope u got it . pls mark me as brainliest

they are made of gases.

they have a spherical shape.

they make energy through fusion.

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.