2. This model of communication shows how components are influenced by different factors like communication skills?

The correct answer to this open question is the following.

Although there are no options attached, we can say the following.

This model of communication shows how components are influenced by different factors like communication skills. Without any further context or reference, we can say that the model could be the Harold Laswell model, which says the following.

There is a WHO that is the sender, that says that that is the message, through a channel that is the medium, to WHOM that is the receiver, and this communication has an effect, that could be understood as the feedback process in which the receiver sends information back to the sender in order to confirm or clarify what the receiver originally expressed.  

The nature of communication is that is a very important process in human interaction. The process of communication is the way humans establish contact with other humans because we are social people that from the very beginning of our lives we begin to interact with others.

i think the life is invaluable.

you can also say immeasurable.

my best guess would be: d allusion

makes the most sense