Some technologies have a number of negative effects. which is a negative outcome of the technology of pesticides a-increased food supply b-harmful to humans if used improperly c-cheaper food d-creation of more jobs

Option B-harmful to humans if used improperly

Explanation:

Most of the technologies have done more harm as compared to the good. Use of pesticides is an example of a technology, which initially boosted the crop production and then started creating negative health impacts due to its excessive usage.

Now a day, lot of farm produce especially the fruits and vegetables have harmful chemicals residing on the outer skin of edibles. Also the pesticides have reduce the fertility of soil thereby lowering the total produce.

Hence, option B is correct

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.