Which change to one of the kits would make it useful for modeling proteins? A. Set 1, add a box for phosphorous (P) atoms.
B. Set 2, add a box for sulfur (S) atoms
C. Set 3, replace the box of phosphorous (P) atoms with a box of sulfur (S) atoms
D. Set 4, replace the box of oxygen (O) atoms with a box of nitrogen atoms (N)

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.