If converting mass to energy in stars causes them to produce light, then what causes stars to produce light? Answer choices: - by making heat - Generating heat - converting mass to energy - photosyntehsis - photosynthetic pigments? - Evaporation of water - heat production - hydrogen and oxygen
converting mass to energy

(Question)
If biofuel is used to produce energy, then what is biofuel used to produce? Answer choices: - disease - chemicals - waste - bamboo - engines - sleep - energy - food
(Answer)
energy

Ques: If when light goes through the pupil, the iris makes it larger or smaller, then what makes the pupil change sizes? Answer choices: - electrically - sun's heat - sweating - It expands - The iris - nerves - environment - heat
Ans: The iris

(Q).
If muscle relaxation occurs when muscle fibers get longer, then what occurs when muscle fibers get longer? Answer choices: - photosynthesis - rapid expansion - kinetic energy - cramps - relaxation - fertilization - movement - sweating
(A).
relaxation

Ques:If buses are used for moving people, then what are used to move people? Answer choices: - bacteria - pencils - cars - tendons - animals - muscles - wind - buses

Ans:buses

If cold fronts cause lightning, then what causes lightning? Answer choices: - dust - energy - cold fronts - sunlight - Energy. - scattered light - fire - heat energy
cold fronts