Bacteria living in the soil are dependent upon which of the following abiotic factors? a. plant root structures and oxygen contentb. soil temperature and water contentc. nitrogen content and insect activityd. insect activity and plant root structures 

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient