Fill in each blank with the correct word. The male reproductive cell is called a(n) The female reproductive cell is called a(n) When the male and female reproductive cells join during fertilization, a forms.​

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

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.