Answer:
Explanation:
Actually it was the experimental results of other scientists. The main stems of the theory was the indivisibility of small spheres (his image) that represented the elements he knew which reacted with other elements. 
They seemed to give the same ratios in reactions (definite proportions) and multiple whole number ratios. Look up Lavoisier.
 
        
             
        
        
        
The appropriate response is hydrogen bonds. Fever is an adjust of gainful and destructive impacts. High fevers can have a tendency to skew the adjust toward the destructive. 
The reality of the matter is that protein optional structure (generally hydrogen bonds) start to denature when moving toward 41 degC (106 degF), however energy likewise change. Energy is a quite major ordeal, even a little temperature move can altogether affect the speed of a response or connection.
        
             
        
        
        
1) C
A population has to be isolated for speciation
2) D
Different species are incapable of reproducing with one another
3) D
When a population is contained, the recessive alleles can become dominant within the population
        
                    
             
        
        
        
Answer:
The correct answer is - it is essential to produce red blood cell and development of the spinal cord and brain.
Explanation:
Folic acid is natural form of vitamin B9 which is essential for producing red blood cells therefore the level of this vitamin should be in proper amount as in fetuses it is crucial for the various organs to develop,
The neural tube, spinal cord, and brain growth requires appropriate amount    of folic acid in pregnant women. Low level of this vitamin can leads to the risk of various disease in baby 
Thus, the correct answer is -it is it is essential to produce red blood cell and development of the spinal cord and brain.