In photosynthesis , electron transport comes at the beginning of the process. Where does the electron transport occur curing cellular respiration. A. In the end of cellular respiration
B. In the beginning just like photosynthesis
C. Electron transport doesn’t happen during cellular respiration
D. In the middle during Krebs cycle

The answer is ax3. hope this

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.