Dna molecules store genetic information and allow for self-replicating life.  molecules of dna can be long and very complex.  they always consist of smaller molecules that are made up of nitrogenous bases, phosphate groups, and 5-carbon sugars.
dna is an example of a complex 
  a. 
carbohydrate polymer
  b. 
inorganic molecule
  c. 
organic molecule
  d. 
protein structure

The correct answer is C. Organic molecule.

Explanation

An organic molecule is a chemical compound that can contain carbon, oxygen, nitrogen, sulfur, among other elements. One of the chemical compounds that can be produced by the union of chemical elements are nucleotides, consisting of five carbons, a nitrogenous base, and a phosphate group. Likewise, when several nucleotides are linked they form longer and more complex chains such as nucleic acids, such as DNA or RNA, where genetic information of living organisms is stored. According to the above, DNA is a complex example of organic molecules. So, the correct answer is B. Organic molecule.

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.