How might bird species A and B come into contact with DDT, a pesticide used by farmers?

By birds that ate or were in contact with plants that were sprayed with DDT .

Explanation:

(DDT) is a versatile pesticide used in agriculture to combat insect plagues. DDT has been prohibited  in many contries because this insecticide might cause health problems in humans, especially during fetal development.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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