yes, it depends on the species of the bacteria. Some bacteria can produce toxin to inhibit the growth or kill the other bacteria if the bacteria doesn't have the specific anti-toxin.
Yes. If you have ever been on Anti-biodics, then you should know. The medicine you take kills all bacteria (even the good ones). You take more medicine to replace the good bacteria. This medicine is...
Bacteria do eat other bacteria, using mechanisms such as phagocytosis and endocytosis. Bdellovibrio bacteriovorus is a kind of bacteria which feeds on other bacteria. It is the purifying agent of...
Some bacteria will consume other bacteria, but in general, individual bacterium are simple enough organisms that they break down entirely on their own.