In habitat A, a late-successional plant grows at a rate of 0.5cm per day when surrounded by early successional plants. If the early-successional plants are removed experimentally, the late-successional plants are observed to grow at a rate of 0.9 cm per day. In habitat B, the same late-successional plant grows at a rate of 0.5 cm per day when surrounded by early-successional plants. If the early-successional plants are removed experimentally, the late-successional plants grow at a rate of 0.3 cm per day. For each habitat, which successional model best describes the system