Organelles are found within the cells.
        
             
        
        
        
The correct option is A.
Succession refers to the process by which the structure of a particular biological community evolves over a period of time. There are primary and secondary succession. Primary succession usually occur in an area in which the soil is not capable of sustaining the growth of plants. The options B, C and D given in the questions are examples of primary succession. 
        
                    
             
        
        
        
The neuromuscular synapse is a chemical synapse between a motoneuron and a muscle cell (muscle fiber). The neuromuscular synapses consist of:
•	the pre-synaptic cell-motoneuron that sends signal by releasing the the neurotransmitter from the synaptic vesicles  
•	synaptic cleft, place where neurotransmitter is released, between motoneuron and muscle fuber
•	post-synaptic cell also called endplate -the muscle cell that receives the signal via receptors.  
 
        
             
        
        
        
Its weaker and the organisms would die off quicker