Xylem and phloem help transport nutrition
        
             
        
        
        
Answer: Because Isabel, where she lives, is salt water which contains salt.
Explanation:
 
        
                    
             
        
        
        
Answer:
rudimentary eyes
Explanation:
Rudimentary eyes are eyes covered by skin that do not respond to visual stimulation.
 
        
             
        
        
        
Answer:
The correct answer is B transcription factors.
Explanation:
Transcription factor are specific regulatory protein also known as sequence specific DNA binding proteins which regulates the process of transcription in eukaryotic cell.
      Transcription factors may either turn on or off the expression of a particular gene to ensure that they are expressed in right cell along with perfect amount and manner.
   Transcription factor such as helix turn helix ,leucine zipper, zinc finger play an important role in regulating the activity of many proteins such as DNA ploymerase, helicase 
 
        
             
        
        
        
The correct answer is B. Pain receptors. Pain receptors are activated by a type of stimulation such as getting hit or cut. These receptors carry this information to our brain using neurotransmitters which then our brain interprets this as pain.