In the compound CaCO3 (calcium carbonate), the subscript 3 at the end of the compound represents the number of
A molecules in the compound
B. elements in the compound
C. atoms of oxygen
D. neutrons in carbon

The first supersonic flight was 1947. it was just above the speed of sound. which altitude would you expect captain yeager to have used for his flight? a) sea level b) 1000m c) 13,700m (within altitude used by commercial planes today) d) 85,000m (where meteor showers originate) will mark brainlist