Final answer:
Fossils are found in some places due to physical and chemical conditions, as well as geological factors and limited extraction machinery.
Step-by-step explanation:
Fossils are found in some places and not in others due to various factors in their paleoenvironment. Physical conditions such as temperature, light, water depth, and energy play a role, as do chemical conditions like salinity, pH, oxygen, and toxic chemicals. Different organisms have different tolerances for these variables, so some may thrive while others perish. Geological factors, limited extraction machinery, and the process of fossil fuel formation also contribute to the distribution of resources.