Question

which sources would preserve the soft tissues of an early mammal? check all that apply. amber in russia frozen soil in the arctic shale in virginia sandstone in the badlands foraminifera in the ocean ice sheets in greenland

Explanation:

Amber can preserve soft - tissues through entombment. Frozen soil in the Arctic and ice sheets in Greenland can preserve them due to cold temperatures slowing decay. Shale, sandstone, and foraminifera typically do not preserve soft - tissues well as they are sedimentary materials that usually cause destruction or poor preservation of soft parts.

Answer:

amber in Russia
frozen soil in the Arctic
ice sheets in Greenland