Osteoporosis is a thinning of the bones that makes them prone to fracture. We often hear of old women who fall and break their hip. More often, their hip breaks causing a fall. What do you think is causing osteoporosis? Is it a lack of collagen or a lack of calcium phosphate? Why?

The image shows ekgs of a person with normal heart waves and of a person having tachycardia. based on this image, what kind of condition is tachycardia? a. the heart beats abnormally fast. b. the heart beats abnormally slow. c. the right atrium of the heart stops working. d. the left ventricle pumps less blood to the aorta.

What causes darkening of the skin as melanin production increases

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration