Which of the following will be the final stage in our sun's life cycle?

the true answer is it'll become a black dwarf at the final stage. it eventually cools, turns into a black dwarf and goes dark. while it is still a white dwarf, the gases forming the outer layer of the star cool and drift away from the core in a formation known as a planetary nebula.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.