16. what is osteoporosis? how can it affect bones? why is calcium important to bones? 17. what is the function of your body oils? 18. what are the functions of tendons and ligaments? 19. what is the function of collagen?

1.Osteoporosis is a disease in which the bones become weak and are more likely to break. A lifetime diet low in calcium and vitamin D makes you more prone to bone loss.

2. It provides energy, absorbs certain nutrients and maintains your core body temperature.

3.A tendon serves to move the bone or structure.A ligament usually serves to hold structures together and keep them stable.

4.Collagen s responsible for skin strength and elasticity, and its degradation leads to wrinkles that accompany aging.

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the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.