Answer:
Amber , permafrost and tar
Explanation:
Amber , permafrost and tar would preserve the soft tissues of an early mammal. Soft tissues of early mammals would preserve in case of amber in Russia. and frozen soil in the Arctic. Although hair and mammary glands are soft tissue but they are not readily fossilized as mammary glands and hairs are derived from dermic structures
Answer:
1, 2, and 6
Explanation:
1: amber in Russia
2: frozen soil in the Arctic
6: ice sheets in Greenland
