They are produced in (d) the ovary
Well this is more heart rate but they're technically the same thing; it's because people who go over their target heart rate are pushing themselves too much, which can lead to dehydration and dizziness/possible fainting.
X-rays have greater frequencies than microwaves.
X-rays have shorter wavelengths and higher frequencies and have more energy than microwaves.
Personally, I would say it is C but I'm not 100% sure
Answer:
Get enough sleep, eat well, and exercise regularly. Reach out to family and friends when times get hard. Get regular medical checkups, and see your provider if you don't feel right. Get help if you think you're depressed.
Explanation: