Which of the following is true about oxygen in plants? oxygen is produced only for photosynthesis and is not used for any other purpose. oxygen is stored in the plant for animals to consume and use for cellular respiration. plants need to take in both carbon dioxide and oxygen for the process of photosynthesis. plants both produce and use oxygen for photosynthesis and cellular respiration, respectively.

The answer is; Plants both produce and use oxygen for photosynthesis and cellular respiration, respectively.

Plants use the energy from the sun to split water molecules to H+ and O2-. The H+ is used to reduce carbon dioxide into glucose molecules. The oxygen is a byproduct that is evolved. However, the cellular respiration of plant cells is similar to that of other organisms on earth. They utilize oxygen to ‘burn’ glucose for energy.

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.