Answer:
B. Rock Layers
Explanation:
The definition is a layer or a series of layers of rock in the ground.
Trace fossil because a trace fossil is a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
Through gene expression, transcription and translation of this subset of genes determines how a cell looks and acts—its phenotype. ... | Cell fate means that a stem cell “makes a decision” to differentiate into a more mature cell type.
I think it is their normal state
