Natural Selection: Naturally, living organisms produce offspring that will inherit characteristics that give that offspring higher and most successful chances of survival. So offspring are naturally born with traits that suits them best for survival. Natural Selection process also consist of in comparison of living organisms, those who adapt best to their environment and have flexible characteristics survive longer than those who don't. 
        
             
        
        
        
It is most likely because Mary’s body went through changes. And from 6 months to a year after pregnancy these “embarrassing symptoms can persist. There can be hormonal changes and cause the body to do abnormal things. 
I hope this helps.
        
             
        
        
        
Answer:
cell transport or membrane transport helps in the transport of solute molecules and ion across the plasma membrane and helps in maintaining homeostasis of these molecules in the biological system.
Explanation:
Homeostasis is very very important to maintain a steady body physiology and the maintenance of steady body physiology is highly significant because any type of disturbance in the homeostasis can leads various physiological abnormalities.
          Various membrane transport process such as osmosis helps in the movement of water from high concentration region to the region of low water concentration until equilibrium is reached.Thus osmosis helps to maintain water homeostasis in our body.
     By the same way glucose transporter maintain the homeostasis of glucose inside our body.
 
        
             
        
        
        
Answer:
larynx
Explanation:
The larynx is the voice box. The vocal folds are part of the larynx. The vocal folds vibrate to create the sound of the voice.