What must be a product of a neutralization reaction between a base and an acid which contains a polyatomic ion? H₂
CO₂
HCl
H₂O

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this

Higher temperature = molecules move around faster. and vice versa.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

They both go downwards and the can break apart rocks