The relationship tends to be positive (increasing) for the predator population and negative (decreasing) for the prey population.
(The relationship; tends; to be positive (increasing) for the predator population and negative (decreasing) for the prey population) (The relationship; to be; positive) (The relationship; increasing; )
The relationship The relationship The relationship
tends to be increasing
to be positive (increasing) for the predator population and negative (decreasing) for the prey population
positive