Suppose that \(t, x) satisfies the partial differential equation av a āt ar (1²) = 0 (i) state whether this equation is linear homogeneous, linear inhomogeneous or non-linear. explain your answer. (ii) separate the variables in this equation and find separate differential equa- tions for the variables t and x. (iii) hence find an expression for the general solution v(t, x).

Hypothesis. why don’t you know this? i learned this stuff in like 5th grade

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;