The Skeletal and Muscle systems. Tutorial ? Question
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When people lose too much bone density as they age-or never reach peak bone density o begin with-they can
develop a condition called osteoporosis. People with osteoporosis have what are called br tle bones and an
increased risk of fractures. Anyone can get osteoporosis, but the following groups are mos suscep ible:
• all women over age 50 (Women are four times more likely than men to develop osteoorosis.
• people with a small skeletal frame
Why do you think these groups have a high risk of osteoporosis?
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amber has allowed scientists to study dna that has been preserved over millions of years.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.