- A organism requires food for survival
- The decrease of something required by an organism has a negative impact on that organism 's survival / that organism 's ability
- So, a decrease of food has a negative impact on organisms

- A decrease of food has a negative impact on organisms
- Negative impacts on organisms / species will decrease the population of the organisms / the species
- Hence, a decrease of food for an organism will decrease that organism's population

- Predators eat prey
- If an organism eats something then that something is a source of frood to that organism
- Therefore, prey is a kind of food for predators

- A decrease of food for an organism will decrease that organism's population
- Prey is a kind of food for predators
- Hence, a decrease of prey will decrease predator

- A decrease of prey will decrease predator
- Population is a measure of the number of a species in an environment
- Therefore, a decrease of prey populations will decrease predator populations

So, a decrease of prey populations will decrease predator populations
[Question]Which will most likely cause a decrease in predator populations?
[Context]- A organism requires food for survival 
- The decrease of something required by an organism has a negative impact on that organism 's survival / that organism 's ability 
- Population is a measure of the number of a species in an environment 
- Predators eat prey 
- If an organism eats something then that something is a source of frood to that organism 
- Negative impacts on organisms / species will decrease the population of the organisms / the species