The baglike structure that contains a clear fluid in which the developing embryo floats is called the

Which statement accurately describes the rock layers? layer 8 is older than layer 1. layer 3 is younger than layer 6. layer 4 and layer 10 are the same relative age. layer 2 and layer 9 are the same relative age.

Ineed to know why d is the correct answer asap

Someone me with this: a mineral' is determined by its actomic structure.