Systematics is the division of Biology where scientists work to determine an evolutionary tree that relates all extant and extinct species. To do this organismal characters that differ among species must be identified. Choose all of the following statements which accurately portray this effort. Check All That Apply

1. Common ancestry often provides shared features which place organisms into the appropriate position of the evolutionary tree,
2. Similarities always reflect common ancestry, this is termed homology.
3. Both birds and mammals are homeotherms which illustrates homoplasy, i. e. that they are each others closest relatives.
4. Organismal characters are identified by observing patterns of similarity among organisms in various possible areas. These include anatomical structures as well as nucleic acid and protein sequence data

1,3,6

Explanation:

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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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.