What is the net ionic equation of 2H+ + SO42- + Ca2+ + 21 → CaSO4 + 2H+ + 21?
O A. H+ + SO42- + Ca2+ + 21 → CaSO4+H+ + 1
B. H2SO4(aq) + Cal2(aq) → CaSO4(s) + 2HI(aq)
O C. SO42- + Ca2+ → CaSO4
D. 2H+ + SO42- + Ca2+ → CaSO4 + 2H+

Plz ill give u brainliest which of the following steps is not likely to take place during cellular respiration? a. oxygen combines with carbon of simple sugar. b. energy molecule transfers energy to cells. d. energy is used up.

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.

The sum of the oxidation numbers in a neutral compound is always