who discovered vaccination for the first time?write a short note on vaccination ? how can we prevent air borne and waterborne diseases

1796

Explanation:

Proclaimed Inventor: A country doctor by the name of Edward Jenner, living in Gloucestershire, England, performed the first vaccination in 1796. These vaccinations by Edward Jenner were made to prevent cowpox and smallpox.

Short note on vaccination: Vaccines work like this: Vaccines contain antigens that our body produces antibodies to attack. Basically, the vaccine contains a variation of the same stuff the virus you're wanting to prevent is made up of so that when the real antigens try to enter your body and wreck havoc, the body will have obtained a mechanism to fight it off.

How can we prevent airborne and waterborne diseases?: Well, you can't necessarily prevent the spread of an airborne or waterborne disease, but if you'd like to avoid it, consider avoiding contact with others, staying home when sick, wearing a face mask in public, and covering your mouth when you cough and sneeze. As for waterborne diseases, the best a human can do is to practice good personal hygiene and drink properly filtered (purified) water.

So, airborne=limited contact, and waterborne=proper care of self and water.

silty loam

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he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?