Which of the following was a major force of atmospheric oxygen? a. decomposition of water b. photosynthesis c. outgassing d. volcanic eruptions

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

What are the charges of the subatomic particles by choosing the answer from the drop down menu. protons have a (+1,0,or-1). (protons,neutrons,electrons) have a 0 charge. 3.) electrons have a (+1,0,-1)