a field is paved over to make a road, but ten years later the road is no longer used. over the next twenty years small grasses and flowers are able to grow, break apart the asphalt, and create a soil with more nutrients in it. what is this process an example of?

Cholera is a bacterial infection of the small intestine. vaccination provides protection against cholera. the cholera vaccine is made up of weakend form of the bacteria that causes cholera. the vaccine will stimulate blank production and elicit an immune response. if the infection occurs again, the bodynwill produce an even greater attack on thre bacteria because of blank.