The (a)   of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.

There are no known (a)   atmospheric microorganisms.

(a)   allows an oxygen concentration that is low enough to allow nitrogenase to function, but high enough that it can provide the bacteria with oxygen for respiration.

As a means of adaptation, there are more (a)   fatty acids in bacteria when they grow at low temperatures.

Planktonic cells that have recently associated with surfaces and exhibit high cAMP levels are called (a)   .

(a)   interactions tend to display self-regulation mechanisms, preventing over-population, destruction of habitats and ultimate extinction.

(a)   is a type of biological interaction where one species causes harm to another organism without any cost or benefits to itself.

In the (a)   reaction, nitrite is first reduced to nitric oxide by nitrite reductase, and then NO reacts with ammonium to yield hydrazine by activity of the enzyme hydrazine synthase.

(a)   is a bioremediation approach which involves seeding with xenobiotic biodegraders.