Question

A(n) __________ is the preserved or mineralized remains (teeth, bones, etc.) or imprint of an organism that lived long ago.

Answer 1

The correct answer for the question is B. Fossil. 
Fossils are remnants, traces of animals or plants, from the past ages that have been preserved. Fossils may be classified as cast and mold fossil, insect preserved in amber, petrified wood, compression fossil of a fern and pyritized ammonite. 

Answer 2

it is fossils because fossils are bone of a living thing that lived long ago