The correct option is B.
Communication between cells can be inter communication or intra communication. Inter communication refers to a type of communication in which message is transfer from a near or distant cell to another cell, while the intra communication form of message transfer is one in which a message is been passed across within a single cell. 
In the option B above, a single cell is involved and that is an example of an intra communication. The other options are example of inter communication.
        
                    
             
        
        
        
ecology; study of living things and the environment
zoology; study of animals
botany; study of plants
microbiology; study of very tiny living beings
 
        
             
        
        
        
Explanation:
The eye receives oxygen through the aqueous. Its function is to nourish the cornea, iris, and lens by carrying nutrients, it removes waste products excreted from the lens, and maintain intraocular pressure and thus maintains the shape of the eye. This gives the eye its shape. It must be clear to function properly.
 
        
                    
             
        
        
        
From: https://answers.yahoo.com/question/index?qid=20111123203903AA4eLha 
1. Less trash to landfill. More recycled items = savings to production costs of new items 
<span>such as aluminum, glass, cardboard. </span>
<span>2. Most insects have particular predators such as a specific animal or bird that eats them as a major or sole portion of their diet. </span>
<span>3. Do not plant 100% of the same plants and trees across the area. </span>
<span>Do not harvest all of a species during a normal growth cycle. If a tree takes 50 years to grow to harvest size, schedule cuttings to avoid extinction of that tree within the area.</span>
        
             
        
        
        
Answer:
D
Explanation:
D) Volume mass and density
volume mass and density do not change because when the necklace is melted down it doesn't change the amount or density of the necklace.