Suppose an experiment was conducted where all of the rabbits were removed from a meadow. Which of the following results is least likely to be observed?

(1) The predator population, such as hawks, would decrease.
(2) The grasses and shrubs would grow taller and fuller.
(3) Flea and tick populations would increase.
(4) Other small herbivore populations would increase.

Option 1 and 2 are correct

Explanation:

In a given ecosystem rabbits serve as prey for several predators. The growth of predator population is depended on the population of rabbits. The higher the population of prey, the higher is the population of predator.  

Thus, if the population of rabbit is decreasing, then the population of predator such as hawks will decrease.  

Since the rabbits eat grasses and shrubs, thus in their absence the productivity of grasses and shrubs will also increase.

Option 1 and 2 are correct

[content deleted] - user123802726recklesschicken

thinking it would be d not too sure but i think it's right