The cardiovascular and immune
If our eyes were sensitive only to x rays the world would appear dark because X-ray light does not reach Earth's surface.
Raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction. However, extreme high temperatures can cause an enzyme to lose its shape (denature) and stop working. pH: Each enzyme has an optimum pH range. ... Extreme pH values can cause enzymes to denature.
Answer:
How our body responds to light and how our body responds to danger.
Explanation:
External stimuli are changes that happen outside the body that our body's scenes can detect.
