One important characteristic shared by all embryos of land vertebraes and aquatic vertebrates is that?

Explanation:

The characteristics shared by all vertebrates (both land and aquatic) is that their embryos develop in watery environment.

Vertebrates are included in the phylum Chordata and all the vertebrates share some common key characteristics at some point in their lifetime. The notochord, present in all embryonic and some adult chordates and it give skeletal support to the chordates.

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.