All other organs, ducts, and glands in the reproductive system are considered secondary, or accessory, reproductive organs. These structures transport and sustain the gametes and nature the developing offspring. 
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According to erikson, development is best reflected in  resolution of psycho-social tasks. <span>Erikson’s psychosocial theory of development considers the impact of external factors, parents and society on personality development from childhood to adulthood. According to Erikson’s theory, every person must pass through a series of eight interrelated stages over the entire life cycle</span>
        
             
        
        
        
Answer:
Because it is a vector quantity, it has a direction too such that derived unit is made up of two or more fundamental units. That is mere and second. That is why it is called as a derived unit as its unit is metres per second. 
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For the second one it’s B or C, I dunno if phototropism is a real word cuz all the rest are vital.