Which sources would preserve the soft tissues of an early mammal

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

1, 2, and 6

Explanation:

1: amber in Russia

2: frozen soil in the Arctic

6: ice sheets in Greenland

surface modification is a versatile tool and has been widely used in material science and engineering that has significantly facilitated the study and characterization of complex materials. at  matexcel, experienced experts in surface science can offer tailored efforts to meet the specific needs from our clients.