Answer: Medication can be tested on the cancer culture before being injected into the patient.
 
        
             
        
        
        
Law of Superposition 
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
 
        
             
        
        
        
C.)
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Like animals, plants must maintain an internal balance, or homeostasis.
Hope this helps chu 
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I would say A) Coevolution because the two species would evolve in response to one another. Flowers and their pollinators must evolve together. For example, if the flower has a mutation that no longer attracts the bumblebees, it will not reproduce. Then the hummingbird would have to find a new food source.