Linnaeus's hierarchical system of classification includes seven levels. what is each of these levels referred to as

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.