From where did the carbon in all living things come?

a. it was made during the big bang.

b. it was made in stars that lived before the solar system formed.

c. it was made in the formation of the solar system.

d. it was produced by cyanobacteria.

hurry! ! nvm. no one answered quickly enough. it was b.

Option B, It was made in stars that lived before the solar system formed.

Explanation:

Almost all the carbon that exists today with in the living organisms was produced in the stars. When these stars exploded during the big bang theory all the carbon within hem was introduced in the environment of earth some billions of years ago. Hence , though carbon introduced in earth’s environment was due to big bang, its origin is from the stars. Hence option B is the correct answer

Cyanobacteria is responsible for generation of oxygen on planet earth and thus option D is in correct.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.