Viruses and bacteria are both microscopic and can both cause disease. viruses differ from bacteria in that all viruses *
a. have cell walls.
b. can be destroyed by antibiotics.
c. need a living host cell to reproduce.

b. can be destroyed by antibiotics.

Explanation:

Antibiotics can act in two different ways:

As a bactericide, completely destroying bacteria, or as a bacteriostatic, inhibiting their replication.

Antibiotics are ineffective against viruses because they do not have their own metabolism. If the antibiotic is given to a patient with a viral infection, it can cause side effects or even antibiotic resistance problems.

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.