Select three of the following and provide an example of how each is a form of evidence upon which the theory of evolution is based.
1. Atavisms
2. Camouflage
3. Continental distribution of extant species or fossils
4. Development of pesticide resistance in insects or antibiotic resistance in bacteria
5. Embryonic development
6. Experiments
7. Fossils
8. Genetics
9. Geologic record
10. High rate of unique (endemic) species on isolated islands
11. Homologous structures
12. Mimicry
13. Ring species
14. Vestigial structures

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.