Answer:
silica
Explanation:
Diatoms are microscopic organisms.  they have  shell that is made from organic compounds and silica.Diatoms contain silica in their cell walls. This material is used industrially in the production of toothpastes, silver polishes, and swimming pool filters. Silica is used to remove  stains and debris.
 
        
             
        
        
        
Answer:cell is the basic unit of life.
A cell may be unicellular or multicellular
Explanation:
 
        
                    
             
        
        
        
<span>The correct answer is number one. A chromosome is composed of many genes. A chromosome is referred to as a DNA molecule in an organism's body, which consists of genetic materials. Chromosomes consists of numerous genes within them, in their nucleus and mitochondria, genes are found inside the Chromosomes itself.</span>
        
             
        
        
        
Answer:
these chromatids separate longitudinally to become individual chromosomes.
one chromosomes is composed of and DNA molecule