What are the geographical characteristics of the region where the yupik tribe lived

They live in arctic region like that of the Diomede Islands of the Bering Seas and thus polar areas.

Explanation:

The Yukik are a tribal people that belong to the race of the Eskimos and are the inhabitants of the polar regions of the earth and mostly occurs in the arctic circle of southwestern Alaska and the Canadian province and even in Russia and are found along the Bering sea and the Yukon delta and they depend on fish as the primary food sources and earth meat of the deer and the whales.

Answer (d) may increase or decrease porosity through dissolution or deposition;

Yeah, i guess that checks out because the unused brain is almost like a clean slate or a new car. it has more value than an older already used brain. -thomasnash