Question

Which of these changes in a pond environment is observable

1. the algae content increases in the summer.

2. the water level is lower
when there is little rain.

3. the water temperature at the surface increases when the sun is out.

4. all of these are observable.

ignore what subject i put this in pls i’m just rushing rn

Answer 1

all of these are observable.

Explanation:

you can look into how algae increase in the summer. You can visually see the water level is lower and you can feel the temperature of the water