Which statement is true of a chemical reaction? O Energy is always absorbed.
Energy is always released.
O Energy is either released or absorbed.
O Energy is not transferred.

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.

there are two significant figures.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.