Most vaccines currently administered are delivered by intramuscular injection. yet the pathogenic organisms these vaccines aim to protect against usually enter the body by a different route. for instance, many viruses infect us via the respiratory tract, and many bacterial pathogens infect via the gastrointestinal tract. one major advantage of delivering vaccines against these organisms via their normal route of infection would

It is essential  for influencing immune responses at the initial site where pathogen first invaded the organism

Explanation:

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when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.