epithelial cells

Quantify Analysis.
Below is a sample of the questions and enclosed is a photo of the sample my instructor posted.
Questions:
1. At approximately what age do men and women have the same bone density? (data interpretation)
2. Around what age do women experience the largest loss of bone density? (data interpretation)
3. What is one reason why women experience a dramatic loss of bone? (research)
4. What is a pathological condition that might result in a loss of bone mass? (research)
Source of the graph: http://bone-health.knoji.com/bone-health-facts-on-boning-up-your-bones/