- A lake is a kind of body of water
- A body of water is a kind of environment
- Hence, a lake is a kind of environment

- A lake is a kind of environment
- As population of predators increases , the population of prey will decrease in an environment
- Therefore, as the population of predators in a lake decreases the population of prey will decrease in that lake

- As the population of predators in a lake decreases the population of prey will decrease in that lake
- Population is a measure of the number of a species in an environment
- So, as the number of predators in a lake decreases the number of prey will decrease in that lake

- Predators eat prey
- If an animal eats other animals for food , then the animal will be the predator
- Hence, if an animal eats another animal then the animal will be the predator and the other animal will be the prey

- If an animal eats another animal then the animal will be the predator and the other animal will be the prey
- Fish eat insects
- Therefore, fish are predators to insects and insects are prey to fish

- As the number of predators in a lake decreases the number of prey will decrease in that lake
- Fish are predators to insects and insects are prey to fish
- So, as the number of fish in a lake increases the number of insects in that lake will decrease

- As the number of fish in a lake increases the number of insects in that lake will decrease
- If something decreases in number then there will be fewer of that something
- So, if the number of fish in a lake increases there will be fewer insects in that lake

Hence, if the number of fish in a lake increases there will be fewer insects in that lake
The number of fish in a lake suddenly increases. How will the increase most likely affect the lake?
- Fish eat insects 
- Population is a measure of the number of a species in an environment 
- If something decreases in number then there will be fewer of that something 
- A lake is a kind of body of water 
- Predators eat prey 
- If an animal eats other animals for food , then the animal will be the predator 
- A body of water is a kind of environment 
- As population of predators increases , the population of prey will decrease in an environment