CARD 22-B 1. Open the brackets using the proper tense form. OVERHUNTING OR OVERHARVESTING There are many historical accounts about how humans (1) (overhunt) and overharvested species, (2) (lead) to their endan- germent, and often, extinction. The Passenger Pigeon is a classic example of how humans (3) (over hunt) a species, leading to the extinction of the en- Eire species. Plant species can also (4). (overharvest), leading to heir endangerment. For example, the Goldenseal plant is a very popular medicinal plant n the United States that (5). 5). (now become) threatened due to (overharvest) in the wild. UNIT 3. LESSON 2 87​