It's recommended that those with osteoporosis a. monitor their blood sugar levels throughout cardiorespiratory activities b. increase their bone density with high-intensity activities c. always have their inhalers close by during flexibility activities d. limit their overall activity time to 20 minutes per day plz !

B. increase their bone density with high-intensity activities.

Explanation:

Osteoporosis refers to a condition in which a person's bones become weak and brittle. This can cause many problems to a person, in particular, fractures. These commonly occur in the hip, wrist or spine. Although this condition can affect all people, Asian and white women who are past menopause are particularly at risk. It is recommended that those with osteoporosis increase their bone density with high-intensity activities, particularly weight-bearing exercises.

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.