*The disease can be transmitted through the air. *The disease agent is too small to be seen under a light microscope.
*There are no known antibiotics that are effective against the disease.
*The genetic material of the disease agent is DNA.
*The disease agent cannot be cultured using any known culture medium.
Is the disease agent most likely a bacterium or a virus?

Scientist are worried about the future of some animals because their number and genetic diversity both is very low.

Genetic variation in the organism of the same species or different species provides the stability for the survival.

Even if the number of organism increases its stability will be low because the genetic variation of those organism is low.

So, even after their number increases they can die due to less variability so genetic variation is equally important as like that of population size.