In studying paraguay street children, the researchers found that these street children had much more contact and interaction with their families than did street children in the united states and canada. this example highlights the developmental issue of

Socio-cultural diversity

Explanation:

According to my research on studies conducted by developmentalists, I can say that based on the information provided within the question this example highlights the developmental issue of Socio-cultural diversity. Which talks about diversity in the context of race, ethnicity, age, gender, religion, nationality and other dimensions that make up the identity of the individual child and impact his or her learning experience diversity.

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the answer to your question is,

old stone age.

-mabel < 3