Chorionic Villus Sampling. Definition: CVS is a test where the doctor collects a tiny piece of the placenta, called chorionic villus, which is then tested to check for chromosomal or genetic disorders in the baby.
        
             
        
        
        
Answer; 
C. A wall of stones and mortar
This would act as a model describing the cell membrane. 
Explanation; 
A cell membrane is made up of a phospholipid bilayer with embedded proteins. 
A cell membrane hold the different components of the cell together and to protect it from the environment outside the cell. It acts as a boundary between the inside environment and the outside environment of a cell.
It regulates the materials that enters and exits the cell; through selective movement of substances in and out of the cell.
 
        
                    
             
        
        
        
The answer's B. hypothalamus
mark me brainliesttt :)))
 
        
             
        
        
        
When stomata are open, carbon dioxide enters the plant through stomata. Carbon dioxide is necessary for the process of photosynthesis in which it is converted together with water into oxygen and glucose. For most plants, it is necessary that stomata are opened during the day when there is a lot of Sunlight also necessary for the process of photosynthesis.
However, some plants from the arid locations have <span>stomata closed during the day, so they reduce water loss that way. In the night when is colder, stomata open and carbon dioxide enters through stomata. </span>
        
             
        
        
        
Answer: A. The enteric nervous system will slow down digestion to conserve energy.
Explanation: