Which best describes how a vaccine works? A. The vaccine causes a nonspecific immune response.
O B. The vaccine cells kill bacteria.
C. The vaccine makes the body create memory cells.
O D. The vaccine produces white blood cells.

C I believe

Explanation: It basically gives you the virus so that your whatever cells can remember next time that its the same thing if you get it and try to fight it off. If you can help me with ap ex unit 2 pretest that'd be great im Jumper-#7209 on discord if you can

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.