Molly is in her 10th week of pregnancy. she is undergoing a procedure in which small threads are removed from the outer membrane that envelops the amniotic sac and fetus. which procedure is she undergoing?
a. cervical variability study
b. chorionic villus sampling
c. chorionic variability sampling
d. none of the above

B

Chorionic Villus Sampling

Explanation:

This is a prenatal test which involves taking a chorionic sample from the Placenta for testing

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.