The endoplasmic reticulum is, in essence, the transportation system of the eukaryotic cell, and has many other important functions such as protein folding. It is a type of organelle made up of two subunits – rough endoplasmic reticulum, and smooth endoplasmic reticulum. It usally has ribosomes attatched to it.
 
        
                    
             
        
        
        
Answer:
scientists got the space station up in space in to small pieces.
Explanation:
The main problem which was faced by the scientist was that there was no powerful rocket which has the ability to lift the whole space station due to its more weight and carry it to the space against the powerful force of gravity. So for solving this problem, space station is taken into pieces into the space and then these pieces should be join to build the space station.
 
        
             
        
        
        
Theres the shoot system and the root system 
the shoot system is above ground and includes the plants organs which are the leaves,stem,buds and flowers
The root system is below ground and includes roots as well as modified stem structures such as tubers and rhizomes
        
                    
             
        
        
        
Is it multiple choice? I believe it's brain, but I could be wrong. 
        
             
        
        
        
Answer:
<h2>b. It allows spinal nerves to exit the spinal cord. </h2>
Explanation:
- The vertebral column is an important characteristic of vertebrates.
-  The formation of the vertebral column takes place from the notochord in the vertebrate.
-  The vertebral column is also known as the spine or generally called the backbone. 
- It forms the spinal canal that is responsible to provide protection to the spinal cord.
-  The vertebral column is divided into many regions into human beings and some other organisms according to its function and position. 
- It has many functions such as protection of the spinal cord, allow passes of spinal nerves and some other.