Water reabsorption through the proximal convoluted tubule is termed obligatory water reabsorption, whereas water reabsorption through the distal convoluted tubule is termed facultative water reabsorption. true or false?

True.

Explanation:

Kidneys plays an important role in the urine formation, body's homeostasis and get rid of body from the excretory waste products. Three main process of urine formation are glomerular filtration, absorption and tubular secretion.

The absorption of water in the proximal convoluted tubule is important and necessary for the osmosis maintenance and termed as obligatory water reabsorption. The water reabsorption in  distal convoluted tubule is under the ADH control and termed as  facultative water reabsorption.

Thus, the answer is true.

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.