Where, if at all, should one or more commas be added in the following sentence? the planet mars which is earth's nearest neighbor has long fascinated scientists as well as science-fiction fans.

"The planet Mars, wich is Earth's nearest neighbor, has long fascinated scientists as well as science-fiction fans."

We use here commas to connect two separated clauses one beign "the planet mars has long fascinated scientists as well as science-fiction fans  and the other is planet Mars being Earth's nearest neighbor.

The correct option is:

The planet Mars, which is Earth's nearest neighbor, has long fascinated scientists as well as science-fiction fans.

Explanation:

There are defining and non-defining relative clauses. Defining relative clauses provide essential information, whereas non-defining can be removed without altering the meaning of the sentence.

In this case, "which is Earth's nearest neighbor" can be removed without changing the meaning.

true

explanation:

the answer is: the start of world war i, and russia’s hopes of benefiting from it

during world war i russian joined due to in their current crisis they were being supported by france and the war was already declared to them by germany, they needed to maintain their political goal and leadership role in the balkans, and is the same feeling that this excerpt evoke the eager of maintain the land value.