O hidrocarbură aromatică mononucleară conține 90,566% C. Determină formula moleculară a hidrocarburii; scrie formulele structurale ale izomerilor posibili si denumirile acestora.

Jewelweed, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. these structures are favorable because they a. can cause genetic changes to occur. b. prevent germination within the seed pod. c. aid in the dispersal of the species. d. attract insects that aid in pollination.

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world