Is oxygen a beginning substance or ending substance?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration

Write the overall equation for the reaction occurring in lithium battery?