The fetus primarily gains weight during the third-trimester. 
        
             
        
        
        
Answer:
CK12, bioninja, and amoeba sisters on yt
Explanation:
They are really helful!!
 
        
                    
             
        
        
        
The answer is B since the energy that the body uses or the energy we have is measured in calories.
Pls mark as Branliest
        
                    
             
        
        
        
B. sulfur tetrafluoride + water → hydrogen fluoride + sulfur dioxide
        
             
        
        
        
Answer:
The correct answer is option 3. a nucleus.
Explanation:
The first genetic material present in the early organisms were RNA which was present in the microscopic organisms back then 3.5 billion years ago which means it is normal to have RNA in such microfossils chemical analysis.
Since, the nucleus was not present in early life forms of prokaryotes like bacteria. so, it is unusual to find nucleus in the fossils of stromatolite rocks.
Thus, option III is the correct answer.