The answer is an embryonic stage. This is the period of gestation right after the implantation, this is when the major organs of a baby are formed. 
In the embryonic stage, <span>ectoderm is the outer layer that develops to a hair, teeth, brain and spinal cord. </span>
        
             
        
        
        
Answer:
"
Natural gas does not produce greenhouse gases as other energy sources do."
Explanation:
The answer, "Coal deposits are found on nearly every continent and mining coal poses few risks." shows only how it can be a better option, but does not show how it can benefit. 
The answer, "Petroleum is relatively inexpensive compared to other forms of energy." only shows how it can be a better option, but does not show how it can benefit.
The answer, "Nuclear power increases water vapor in the atmosphere." does not clearly state how this benefits us.
<em>-kiniwih426</em>
 
        
             
        
        
        
Explanation:
base on the person opinion
 
        
             
        
        
        
Answer: D. A river separates members of a squirrel population that used to occupy the same geographical area.
Explanation:
Allopathic Speciation occurs when a geographic barrier (river, mountain, or canyon) separates members of a population 
Hope this helps!
 
        
             
        
        
        
The sequence of B) nucleotides in a DNA molecule determines the protein that will be produced.