Saying that claims tend to take standard forms means that

It means that within a given culture, most claims will tend to have similar elements.

Explanation:

Claiming is the action of trying to repurchase something that is in someone else's possession. This verb can still refer to the act of requesting something that one must possess by right. In this sense, the word claim is commonly used when one wishes to convey the idea of something to be constantly requested as if it were an obligation to be followed or acquired.

Since a society tends to have the same problems, rights and duties, it is normal to conclude that claims tend to take standard forms. This means that within a given culture, most claims will tend to have similar elements.

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chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.