Questions

Polygenic inheritance involves the determination of a particular phenotypic characteristic by many genes, called polygenes(group of genes influencing a quantitative characteristic), each having a small effect individually.

Height and skin colour in humans are examples of Polygenic characters.

It is a protocol used to advertise the set of networks that can be reached with in an autonomous system. BGP enables this information to be shared with the autonomous system. 

While dew , fog and mist are formed due to condensation of vapour into water drops, hail falls from the clouds in the form of hard pellets of ice.

Salinity is often high in enclosed seas, this is due to high temperature, rapid evaparation and little inflow of fresh water.

A program is a group of related projects managed in a coordinated way to obtain benefits and  control  not available from managing them individually. Programs may include elements of related work outside of the scope of the discrete projects in the program.

For example:

A New car model program can be broken up into projects  for the design and upgrades of each major component (transmission, engine, interior, exterior) while the ongoing manufacturing occurs on the assembly line