- A cat is startled by a loud noise
- A cat is a kind of animal
- Hence, loud noises can cause animals to startle

- Objects in an environment are a part of that environment
- Objects in an environment may produce loud noises
- Hence, an environment may produce loud noises

- Loud noises can cause animals to startle
- An environment may produce loud noises
- Therefore, an environment may cause animals to startle

- A cat is a kind of animal
- A cat jumps when startled
- Hence, some animals jump when startled

- An environment may cause animals to startle
- Some animals jump when startled
- So, an environment may cause animals to startle and jump

- An environment may cause animals to startle and jump
- An animal is a kind of organism
- Therefore, an environment may cause organisms such as animals to startle and jump

- An environment may cause organisms such as animals to startle and jump
- If something causes something else, then that something else is a response to that something
- Therefore, an example of an organism responding to its external environment is an animal jumping when startled

Hence, an example of an organism responding to its external environment is an animal jumping when startled
A cat jumps when startled by a loud noise. This is an example of an organism
- An animal is a kind of organism 
- Objects in an environment are a part of that environment 
- A cat is startled by a loud noise 
- If something causes something else, then that something else is a response to that something 
- Objects in an environment may produce loud noises 
- A cat is a kind of animal 
- A cat jumps when startled