Answer:
Explanation:
Organisms have different forms of circulatory systems. Humans have a closed circulatory system, while many mollusks and other invertebrates have an open system. In a closed circulatory system, blood is enclosed within blood vessels.
 
        
             
        
        
        
Answer:
-mutations
-exchanges of genetic material between mature, adult organisms
-the introduction of viral genes through lysogenic infections
-genes being passed from parents to offspring
Explanation:
 
        
             
        
        
        
Answer:
By running them under water. The water will separate the rocks from the dirt.
 
        
             
        
        
        
Answer:
Molecules  carrying amino acids are positioned in the  ribosome’s two docking sites.
Explanation:
A ribosome is a molecular machine that  coordinates protein assembly. 
- A ribosome brings together correctly the  mRNA, which needs to be translated, and  the tRNA, which assists in the translation process, to come together correctly.
- During translation, tRNA molecules  carrying amino acids are positioned in the  ribosome’s two docking sites.
- After the translation, the tRNA disassemble and is being reused many times.