Question

The levels of a sedimentary rock are shown. From top to bottom, the levels are 1, 2, 3, 4.
Identify which examples are fossils. Select all of the boxes that apply.

the preserved remains of a living organism

a 100-year-old tortoise

a dinosaur footprint found in a rock layer

a mosquito from 65 million years ago trapped in sap

Answer 1

Select:
- the preserved remains of a living organism — Yes (this is the basic definition of a fossil)
- a 100-year-old tortoise — No (too recent and not fossilized)
- a dinosaur footprint found in a rock layer — Yes (a trace fossil)
- a mosquito from 65 million years ago trapped in sap — Yes (an organism preserved in amber)