For over a decade, farmers in the u. s. have been planting genetically modified crops. an example of one of these crops is corn that is resistant to weed-killer. this makes it so that no corn is lost due to contact with herbicide meant to kill weeds. while this is seen by many as a positive development, others see it as a cause for concern. what is one possible negative side effect of planting genetically modified corn? a) genetically modified corn, as well as other plants, is unnatural. b) corn will replace wheat and other crops as our main source of carbohydrates. c) plants with modified genomes may have a predictable impact on the environment. eliminate d) plants with modified genomes may have an unforeseen impact on the environment.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

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