The scala media is rich in k+ while the scale vestibuli and tympani are rich in na+.
a. true
b. false

The given statement is True.

Explanation:

Scala media has endolymph as its constituent and endolymph  is rich in Potassium ions (K+)

whereas

Scala tympani and  scala vestibuli has in its composition Perilymph and Perilymph has sodium ions as their major constituent ions.

Therefore, scala media is Potassium ion rich while scala tympani and vestibuli are sodium ion rich.

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explanation:

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.