The blank a planet is to the sun

What part did glaciers play in forming the great lakes?

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

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d