Why have the rules governing building on permafrost changed? a) perafrost used to be permanent b) expanding population has forced buliding on permafrost. c) permafrost has expanded near population centers d) international commissions have held joint symposiums.

Why are fossils of organism's from the phanerozoic eon much more likely to be found than fossils of organisms from any other eon? a. more organisms present during the phanerozoic eon had soft body parts. b. organisms present during the phanerozoic eon were all microscopic. c. more organisms present during the phanerozoic eon had hard body parts. d. organisms present during the phanerozoic eon are the most ancient life forms.

Explore the ways that boundaries influence identity, interaction and exchange. things to consider: what is the race/ethnicity. how easy is it to interact/trade with others.

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?