The (1) is the shapeless background against which collagen fibers are seen through the microscope. Molecules
in ground substance include (2), a long, unbranched
polysaccharide that is very slippery, and (3), which are
formed from proteins and polysaccharides. Proteoglycan
(4) are composed of 80-100 polysaccharides, called
(5), each attached at one end to a common protein core.
If the protein cores of proteoglycan monomers attach to
hyaluronic acid, proteoglycan O are formed.
Proteoglycans trap large quantities of (7), which allows
them to return to their original shape when compressed or
deformed. Several adhesive molecules are found in ground
substance, including (8) in cartilage, 12 in bone, and
(10) in fibrous connective tissue.

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.

c. is the correct answer

a = executive branch; b = judicial branch