Answer:
The movement of the sea urchins into habitats already occupied by black-lipped abalone will most likely cause a decrease in the level of available food resources for the abalone. Sea urchins are known to feed on kelp, which is a primary food source for black-lipped abalone. Therefore, the influx of sea urchins into the habitat could lead to competition for food and a reduction in the abundance of kelp, negatively impacting the abalone population.