Question

task 1: gg rock layers (geologic
why do some rock layers have no fossils?
they were never exposed to sunlight
no living things were present when the layer formed
fossils can only form in lava rock
the fossils melted away

Explanation:

Fossils are formed from the remains of living organisms. If no living things were present when a rock layer formed, there would be no organic material to fossilize. Exposure to sunlight is not relevant to fossil formation. Fossils do not form only in lava rock (igneous rocks, especially lava - formed ones, are less likely to have fossils as the high temperatures destroy organic material). And the idea of fossils "melting away" is not a valid geological concept in the context of rock - layer formation.

Answer:

No living things were present when the layer formed.