This curve (Dyball & Newell Figure 5.6): shows a balancing (negative) feedback relationship. indicates that socio-ecological perfection has been met. proves that unlimited growth is possible. is an example of an exponential relationship. This curve (Dyball & Newell Figure 5.9): shows an example of \"goal-seeking\". is a result of processes involving balancing (negative) feedback. is a result of processes involving reinforcing (positive) feedback. \"a\" and \"b\" above are correct. \"a\" and \"c\" above are correct