The formation of foam is evidence that

A) photosynthesis

B) protein synthesis

C) respiration

D) cell division

Is taking place because

A) oxygen

B) yeast

C) carbon dioxide

D) glucose

Is a product of

A) protein synthesis

B) respiration

C) cell division

D) photosynthesis

C) respiration

C) carbon dioxide

B) respiration

Explanation:

In the process of respiration at cellular level, glucose is com busted in the presence of oxygen to produce carbon dioxide and water.  

The chemical equation is as follows -  

C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy  

The carbon dioxide released at the end of respiration is responsible for producing the foam especially during the cell respiration in anaerobic condition.  

Hence, correct options are

C) respiration

C) carbon dioxide

B) respiration

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 listed your answers right then i believe your answer is b.