@Rj Kartik sir struggle life story

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives. _______________ the course of the development of different life-forms heredity—which, in plain English, is unconscious memory generated in the first life-form and ______________ through all the different species—is the sole factor in the ____________ of the parent properties, while adaptation to surrounding conditions and circumstances, natural selection in the struggle _____________ existence, and partner selection in the struggle of the males for ____________ are the principal factors in the differentiation of species. the struggle of the males for ____________ are the principal factors

Do you think it a significant detail in the story that Anil is a struggling writer? Does this explain his behaviour in any way?

Struggle To Survive

Define struggle for existence.