19. It is the ability of the heart, blood vessels, and the respiratory system to deliver oxygen throughout the body over an extended period of time A. speed c. flexibility B. cardiovascular endurance D. speed 21. It refers to having low weight to height ratio. A. Underweight B. Overweight C. Stunted Growth D. Obesity 22. It is the condition where objects are seen clearly and close distance but appear blurry at a distance. A. Myopia B. Strabismus C. Hyperopia D. Xeropthalmia 23. This is the largest organ of the body. A. Eyes B. Skin C. Ear D. Tongue 24. This are a horn-like envelope covering the tips of the fungus and toes in human B. Hair C. Skin A. Nails D. Vision​