How is brazil's economic positioning?

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

As water is cooled from 4 c to 0 c its density

Suppose you had to resolve the problems believed to be caused by distance decay in russia. what would you suggest?