Answer:
All of them seems true tho 
 
        
                    
             
        
        
        
Contain structures that regulate and perform life functions.
        
             
        
        
        
Answer:
Neurulation of organogenesis is the last stage of human development. The gastrula stage forms three germ layers called ectoderm, mesoderm, and endoderm
 
        
                    
             
        
        
        
Doctors inject medicines in veins because veins are more accessible and donot have high pressure due to which there is no risk of blood backing up with into the infused fluid.
However there are some cases when medicine is injected in artery but a lot of precautions needs to be taken while doing so.
        
             
        
        
        
Answer:
the net force would be 45n 
Explanation:
20n+25n=45