SCIENCE
ZOOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
When fishes are kept in an aquarium containing water but no aquatic plants they frequently come to the surface and float in a semivertical position for want of.
|
|
Air
|
|
|
Oxygen
|
|
|
Dissolved oxygen
|
|
|
Fresh supply of oxygen
|
Explanation:
There is 1 question to complete.