Think of it as the “energy currency” of the cell. If a cell needs to spend energy to accomplish a task, the ATP molecular
        
             
        
        
        
<span>Planaria have a huge regenerative power because of the presence of adult stem cells called neoblasts. If you cut Planaria into pieces, each piece can regenerate into a complete organism and that’s a form of asexual reproduction. Cells which are located on the wound site proliferate to form a blastema-mass of cell that will grow into a new organ. Those cells will differentiate into new tissues and regenerate the missing parts.</span> 
<span>The similar thing is happening with starfish.</span>
        
             
        
        
        
Yes, There is no spherical symmetry in biology. But is in Spherical
 
        
             
        
        
        
<u>Answer:</u>
If calcium were removed from the tissue then the polarity will be established within the cell but polarity will be lost in the tissue. 
<u>Explanation:</u>
- Cell polarity is the cellular components like cytoplasm, plasma membranes and other various cell organelles in the asymmetric order. 
- The coordinated arrangement of this cell polarity in tissue plane is called as planar cell polarity (PCP). 
- Calcium is the major component in the tissues that helps in formation of bones and other parts of body, if it is removed then the polarity will not be seen in the tissue, but in the cell the polarity will be established.
 
        
             
        
        
        
The appropriate response is classical conditioning. It is a learning procedure that happens when two boosts are over and over combined; a reaction that is at first inspired by the second jolt is at the end evoked by the primary jolt alone. Classical conditioning is the essential learning procedure, and its neural substrates are presently starting to be caught on.