Answer:
Element
Explanation:
All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element. ... <u>An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.</u>
 
        
                    
             
        
        
        
Wait this is highschool biology?! 
Woah... thought it would be harder....
Anyways, see "micro" means really small, so small that your bare eyesight can't take it (or see it, I don't care). A microscope was meant to see things that our eyes can't. Since humans cant see microlife we use a microscope. 
Mind Blown...
        
             
        
        
        
Answer:D 
Explanation: Because it has the least amount of density in it. All the others are heavier, meaning they will sink. Just like if you drop a rock water and a feather, the feather will float. 
Density def: 
Density, mass of a unit volume of a material substance. ... Density offers a convenient means of obtaining the mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = Vd), while the volume is equal to the mass divided by the density (V = M/d). 
 
        
                    
             
        
        
        
Answer:
Cells on either side of the cut pull toward each other until they close the gap.
~Hope this helps!~
 
        
             
        
        
        
Answer:
Las interacciones interespecíficas son determinantes importantes de la dinámica de la población y la estructura del paisaje puede influir en estas interacciones. Todas las especies interactúan con depredadores, parásitos, competidores, etc., como parte biótica de su entorno.
Explanation: