In the 1700s, organisms were broken into only two kingdoms - Animalia and Vegetabilia. Throughout the next few hundred years, the name Plantae replaced Vegetabilia, and other kingdoms began to emerge. Finally, in the 1900s, the currently accepted six kingdom system was adopted.

Currently, the kingdoms include: Plantae, Animalia, Fungi, Protista, Archaebacteria, and Eubacteria.

The development of the current classification system is probably due to .
A.
the discovery of differences between organisms
B.
the discovery of new organisms
C.
the invention of new technology and scientific techniques
D.
all of these

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

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4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

trachea, alveoli, lung capillaries, arteries