A geologist studies a layered rock to determine its age. Bacteria fossils from the Precambrian Age are found in the rock's upper layers, but no fossils are found in the rock's bottom layers
Which of these conclusions about the rock is best supported by the evidence?
The age of the entire rock is equal to the age of the fossils.
O The rock formed quickly through a series of rapid changes.
O The top layers of the rock are much older than its bottom layers
The bottom layers of the rock could have formed before life occurred

sexual reproduction produces offspring with novel combinations of genes. species that reproduce sexually must maintain two different types of individuals, males and females, which can limit the ability to colonize new habitats as both sexes must be present.

the cytokine-activated janus kinase (jak)-signal transducer and activator of transcription (stat) pathway has an important role in the control of immune responses. dysregulation of jak-stat signaling is associated with various immune disorders.

c.           is the correct answer