How is ph related to the concentration of hydronium ions?

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

[01.07]what is the answer to the problem: 101 g + 25.01 g + 5.05 g? 131.06 g 131.1 g 131 g 130 g

What are the coefficients to balance the following equation? ba+br=babr2