In lakes and ponds there is a whole ecosystem, with its animals and plants. Between them they are in charge of maintaining the entire habitat in favorable conditions for living. The fish tank does not have that cleaning system.
The bacteria and algae get out of control and takes up all the oxygen
DNA is the bio molecule that contains all of the organisms genes. when cell divides through mitosis, the daughter cells contains exact copies of DNA from both of its parents.
If you're taking the final I went with High Specific Heat
I think its slit clay then sand sorry if its not correct