Which equation obeys the law of conservation of mass? H2(g) + O2(g) → H2O(g) H2(g) + O2(g) → H2O(g) +4He(g) 2H2(g) + O2(g) → 2H2O(g) H2(g) → H2O(g) H2(g) + O2(g) → 2H2O(g)

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll