In this scenario, the type of succession event that most likely occurred can be determined by looking at the given options and their characteristics:
1. Spruce, Birch trees, Maple trees: These are all types of trees, indicating a progression from smaller to larger plants, which suggests primary succession.
2. Shrubs, Grasses: Shrubs and grasses are smaller plants that typically colonize an area after a disturbance, which points towards secondary succession.
Based on the plant types mentioned in the question and their typical sequence in succession events, the correct pairings are:
- Primary succession - Forest fire: This is because primary succession starts in an area where there was no life before, like after a forest fire where the soil is barren and needs to be colonized by pioneer species such as grasses and shrubs first before trees can grow.
- Secondary succession - Flooding: Secondary succession occurs in an area where there was previous life, but it was disturbed or removed, like after a flooding event where the soil is still present, allowing for faster recolonization by plants like shrubs and grasses.
Therefore, the most likely pairings for the type of succession with the event that occurred are primary succession with a forest fire and secondary succession with flooding based on the plant types provided in the question and the characteristics of each type of succession.
