Stem cells grown on a hard, rigid surface are biased into differentiating into a bone cell lineage.  
the answer is its bone cells
 
        
             
        
        
        
The correct answer is: introns
Processing of mRNA is process that occurs only in eukaryotic cells. After the transcription, newly formed mRNA molecule is called and it must be processed into a messenger RNA (mRNA). Processing includes:
•	Addition of a 5' cap to the beginning of the RNA
•	Polyadenilation- addition of a poly-A tail (tail of A nucleotides) to the end of the RNA
•	Splicing- removal of introns and linking the exons
After these steps mRNA is mature and used for the further steps (e.g. translation).
Sometimes some genes are alternatively spliced.
 
        
             
        
        
        
Humans Come From A Guy Sperm It Goes Into The Females Egg
 
        
                    
             
        
        
        
To be pregnant, an equilibrium in ph and chemical contents of the uterus and the outside environment has to be maintained, to prevent any reactions of the chemical sustances taken in by the person pregnant and the baby *has something to do with concentration gradient, hence yes, pregnancy can count as homeostasis 
 
        
             
        
        
        
The answer is b. plant structures.
Photosynthesis is the process by which plants use solar energy to produce glucose from carbon dioxide and water. Carbon dioxide enters the leaves, plant structures, through the<span> stoma and is incorporated into organic compounds. </span>