- Flooding decreases the availability of food
- A living thing requires food for survival
- Therefore, flooding can decrease the availability of food required by living things for survival

- Flooding can decrease the availability of food required by living things for survival
- A parrot is a kind of living thing
- Therefore, flooding can decrease the availability of food required by parrots for survival

- The decrease of something required by an organism has a negative impact on that organism 's survival
- A parrot is a kind of organism
- So, the decrease of something required by a parrot has a negative impact on that parrot's survival

- Flooding can decrease the availability of food required by parrots for survival
- The decrease of something required by a parrot has a negative impact on that parrot's survival
- Hence, flooding decreasing food availability has a negative impact on parrots survival

So, flooding decreasing food availability has a negative impact on parrots survival
Question: A certain species of endangered parrots lives on an island that can be seriously affected by large floods. Which of these is considered a negative impact to the parrot population from flooding?
Context: - The decrease of something required by an organism has a negative impact on that organism 's survival 
- Flooding decreases the availability of food 
- A parrot is a kind of organism 
- A living thing requires food for survival 
- A parrot is a kind of living thing