A swim bladder can inflate and deflate when the swim bladder inflates it moves on the surface of the water but if it deflates it will go to the under section of the water <span />

The use of resources should be sustainable because many non renewable resources like coal and petroleum can be exhausted if they are over exploited.
Answer:
I think it's (E) but I'm not sure
This fungi is a type of mushroom, so it is used in salads.
The answer is b) Surveying opinions of fellow classmates