After studying the various sources of drugs, a group of students demonstrate a need for additional study when they identify which as an example of a synthetic source for a drug:

Here are the options to complete the question

A. plants

B. animals

C. inorganic compounds

D. genetic engineering

The CORRECT ANSWER IS D.

D. genetic engineering

Explanation:

Drugs can be produced or obtained by extracting the essential component needed from a plant source, animal source and inorganic compounds.

Genetic engineering is a synthetic source of drug production, needed to solve or make ready drugs with the aid of advanced technology/process.

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.

if you know your abc's you should be able to get your answer or just use google