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.

1: Antibodies

2. Memory cells

Explanation:

Cholera vaccine contains weakened pathogen of cholera that serves as antigen and initiates the immune response. Identification of cholera antigen is followed by the formation of antibodies specific for the antigen.  

Production of antibodies occurs through clonal propagation of B cells. Multiplication of B cells produce antibodies and memory cells. Antibodies kill the antigens while memory cells are long-lived and serve to elicit quicker and stronger immune response upon encounter with same antigen ever again.  

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.