vectors
pathogens
We call this a pathogen. Path- means disease while -gen means to make.
Pathogens.
Well, they can get it from other animals. For example: Rabies can be given to a coyote through another animal biting the coyote.
Animals under drug testing often are given medicines which are not completely studied and therefore there is a danger of those animals carrying the effect of the drugs they are on into the wild. They are often given pathogens to cause diseases in them, which are then carefully monitored for effects of new medication. I will be extremely dangerous to other wild animals, pets and humans if such an animal would come free. Protocols of treatment ensure that the treatment is given/administered under humane methods and mechanisms.
Heartworm exists in the heart of dogs or cats. it is also carried through mosquito's so it can then be given to other animals.
To get your immune system prepared if the same pathogens attack your body again.
an antibiotic is a medication given to someone who has some type of infection. it fights the pathogens. =]
How unicellular organisms may have given rise to the first animals?
To carry out the orders given by his or her superiors.
Terrestrial Animals
Animals with backbones are known as vertibrates.