It is referred as <span>zone of proximal development. The zone of proximal development enables a person to distinguish what he or she is capable of with help towards others and without it. It is somehow related to the given sentence above where it shows how children can do on their own and with the help of another person.</span>
Endorphins reducing stress levels
I think it is c because primary research is original and from the certain time while secondary research is collected from others by research and stuff
