Answer: CO alarms have a life expectancy of around seven years. The CO alarm will beep every 30 seconds or display ERR or END. If a CO alarm is at its end-of-life, replacing the battery will not stop the beep. Most detectors will beep 4 or 5 times in a row about every 4 seconds. Do not mistake dangerous levels of poisonous gas for a detector with low battery.
Explanation: (credits to the internet) Hope this helped! :D
1. traits
2. genes
3. DNA
4. environment
5. 23
6. haploid
7. half
8. fertilization
9. 46
10. zygote
11. half
12. randomly
13. different
Hope this helps a little :)
