In what world regions are the hearths of the indo-european languages?

Originally in Anatolia, but spread around Europe (hence the name Indo-European)

Explanation:

A hearth is where something originated from. So the beginning of a branch of languages starts with a single language that evolves into different dialects and vocabulary to form a different language branched off from the original.

answer; (d) melting of sea ice;

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.