Question

task 3: fossils
fossils are...
preserved bones, teeth or shells from long ago
preserved candy wrappers, soft drink cans and baseball caps from long ago
preserved tracks, burrows or impressions from long ago
both a and c are correct

Explanation:

Fossils can be the preserved hard parts like bones, teeth or shells (option a) and also trace fossils such as preserved tracks, burrows or impressions (option c). Candy wrappers, soft - drink cans and baseball caps are modern human - made objects and not fossils.

Answer:

both a and c are correct