Answer:
Which of the following equations are balanced correctly?
2Ag2O → 4Ag + O2
Zn + HCl → ZnCl2 + H2
Cu + H2O → CuO + H2
2C4H10 + 13O2 → 8CO2 + 10H2O
Explanation:
Circulatory system related to respiratory system<span> in </span>crayfish<span>. both uses gills. in respiration walking legs and maxilla move water across gills. in circulation blood</span>
C maybe not sure please make sure