Responding to the environment by maintaining a stable internal environment despite changing external conditions is

Scientist believe that earths core is around 6000°c where does this heat come from

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

Can someone me with this plz? ! i'm putting 20 points on it!