Which feature of enceladus and europa would indicate the possible presence of life?

Enceladus, one of Saturn's moons of only about 314 miles in diameter hides in its entrails an ocean of liquid water that is rich in organic molecules, making it one of the places where it is most likely to find some form of extraterrestrial life.

Europa is a strange shaped moon of Jupiter with a large number of intersecting lines. Models from the interior of Europe show that under a thin crust of 5 km (3 miles) of water ice, Europa can have oceans with 50 km (30 miles) of depth or more. The visible marks of Europa could be the result of a global expansion where the crust could have been fractured, filled with water and frozen.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

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.