6. a cell is 20 micrometers across. what type of cell is this? a. plantae b. prokaryotic c. animalia d. eukaryotic

D

Explanation:

Eukaryotic cells are usually bigger than prokaryotic cells. Generally, prokaryotes cels size will range between 1 and 10 micrometers while that of eukaryotes will range between 10 – 30 micrometers. Due to the small cell size of prokaryotes, elements can diffuse in and out of the whole cell. However, for eukaryotes, cellular mechanism need to assist the distribution (in and out) of elements  in the cell.

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.