Teamwork is a necessary part of all social activities. Without it, nothing would ever understand the light of the day. No prodigious project can be completed or even successful if people don't work or collaborate with each other. The efforts or struggles that we made individually are valuable too but they are likely to be pointless without good, communally beneficial, synchronized cooperation. As an individual despite struggling you cannot achieve any big goal merely by yourself. In other words, It is simply impossible because each of us retains only a limited amount of time, resources, knowledge and skills.