Approximately how long does the menstrual cycle last if fertilization does not take place?

Explain why you would or would not have a lasik surgery if you wore contacts or glasses.describe how public opinions related to this surgery have changed over the years.in your own words, explain this surgery as though you are explaining it to someone who has no knowledge of the procedure

Which one is not a part of the base of the cranial cavity? a.scala anterior b.scala media c.scala lateralis d.scala posterior

Explain why many people are concerned about uv rays? explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?