A buffer would be the least likely to harm the fish. Buffers help resist pH change.
A chromosome is a DNA (deoxyribonucleic acid) molecule with part or all of the genetic material (genome) of an organism. Essentially, chromosomes are the basic building block of who we, as humans, are. They make up or DNA structure and are responsible for if we have blue eyes or black hair, without chromosomes, us as humans wouldn't exist. We, as humans, are the organisms that chromosomes make.

Three major parts of The cell theory :-
1. Cells are the unit of structure of all living things.
2. Cells are the unit of function of living things-they carry out life processes .
3. All cells come from pre-existing cells.
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Antibiotics, are helpful for treating the common cold, however due to them being very powerful medicine, they are not highly recommended.
The combustion of the carbon results in the generation of the carbon dioxide and the carbon monoxides. Other than this, the reaction of the carbon compounds also causes the release of methane. The reaction of the carbon with various substances also result in the formation of CFCs (Chlorofluorocarbons)
All the mentioned gases are well known green house gases. All the green house gases traps the heat in the earth's atmosphere and cause global warming.