Questions

In DNA, the chemicals are Adenine, thymine, guanine and cytosine. They always pair as basepairs like Adenine with Thymine and Guanine with Cytosine.

Zoroastrianism, the ancient pre-Islamic religion of Iran that survives there in isolated areas and, more prosperously, in India, where the descendants of Zoroastrian Iranian (Persian) immigrants are known as Parsis, or Parsees.

PIGEON

From Statement I -I. O is placed fourth to the right of P. G is not placed immediately next to either P or O.P_ G _ O _

From Statement II -II. N is placed immediately next (either left or right) to O. E is placed immediately next (either left or right) to G.N OO Nby combining both I & II Statement we can conclude -P_ G E O N

P I G E O N

Hence,statement I and II are sufficient to answer the question, while the data in statement III alone are not sufficient to answer the question.

The thinnest layer is crust. It is about 100km. Where as mantle ranges upto 2900 km and the inner most core ranges upto 6300km.

Crystal size in igneous rocks is determined by rate of cooling i.e, the time taken by magma to cool down. 

Hence, the slower the rate of cooling the larger the crystals. The faster the rate of cooling the smaller the crystals.