The serum ELISA test is based upon immune mechanisms. Which of the following is a large molecule that evokes an immune response?

This question is incomplete because of the absence of options

Explanation:

Serum ELISA test is based on antigen-antibody interaction (which is the immune mechanism referred to in the question). Both antigen and antibodies are proteins and thus can be referred to as large molecules. In some cases, the ELISA test kit wells are coated with antibodies that are specific to choice antigens in the serum while in some other cases the wells are coated with antigens that are specific to choice antibodies in the serum. Thus, either antibody or antigen (both proteins) present in the serum can evoke an immune response (depending on what the well is coated with) which causes a reaction to proceed; this reaction can be determined by a microplate reader.  

From the above, it can be deduced that either the antigens or the antibodies can evoke an immune response.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.