Answer:
1-less sunlight.
2-false, one organism always benefits while the other could have different impacts.
Both animals benefit in mutualism( type of symbiosis)
3-the impact that population cycles have on predators.
(When a prey species is rare, food and space are plentiful, and its population increases rapidly. Meanwhile, the population of predators that feeds on it grows only once the prey population is big enough to fuel expansion)
hope this helps
