Plate tectonics is referred to a geology theory, which explains the movement of earth’s lithosphere.  This theory suggests that the earth’s lithosphere is made up of many plates, and these plates move on each other causing collision of the plates or sometimes separation of the landmasses.  
Sometimes, the movements of the plate occur in such a way that the surface of the earth is buried underground. Even in normal circumstance, some of the surface materials buried underground. So, by studying the type of things existed on the surface in past, one can predict the abundance of a specific substance underground.  
Hence, the correct answer is option b. – Plate tectonics.  
 
        
             
        
        
        
<span>The job of these envelope extensions is to increase the bacteria's surface area so they can absorb more nutrients and grow. This is especially important in an adverse environment that lacks a lot of resources.</span>
        
                    
             
        
        
        
The correct answer is A. They are synthesized. 
In the endoplasmic reticulum, proteins are synthesized on to the surface of a rough endoplasmic reticulum. With the help of ribosomes which contains mRNA, the small bounded organelles enter the chamber where mRNA which contains proteins is being released.
Endoplasmic reticulum also regulates the quality of the proteins.
        
                    
             
        
        
        
The answer is Phototropism, this is because the tip of the plant moves towards the light and the auxins make the plant elongate on the side with no light.
        
             
        
        
        
1. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.
2. The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you.