Biotechnology is a growing field of applied biology. many crops, such as corn, have been engineered to be resistant to herbicides. therefore, farmers can spray these chemicals to kill weeds growing near the crops without worries of killing the crop itself.
how does this type of biotechnology work?
a. by changing the location of the crops
b. by changing the type of crops used
c. by changing the genetic makeup of the crops
d. by causing the crops to kill the weeds

Option C, by changing the genetic makeup of the crops

Explanation:

In a genetically engineered crop, certain traits of a crop are modified to improvise its breed. In this way a crop can be made pest /insecticide resistant which means that a genetically modified (GMO) crop will not be affected by the pest or insecticides. Thus, even though a spray is used near and around a pesticide resistant crop to kill the weeds and unwanted plants , the sprayed chemical will have negligible adverse impact on it.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.