The external auditory canal is the communication channel between the ear pinna and the middle ear. It can be divided into two regions, one outermost and one innermost. The outermost region is of cartilaginous consistency and is covered by very fine hair and glands that secrete the earwax, a sticky yellow substance that acts to retain dust and microorganisms. The innermost region is of bone consistency and is housed in the temporal bone, one of the skull bones. The external auditory canal ends in a membrane called the tympanic membrane.
Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation
What would most likely happen if a person increased the amount of saturated fat in his or her diet? the person's risk of cardiovascular disease would increase. the person's risk of cardiovascular disease would decrease. the person's bad cholesterol would decrease. the person’s good cholesterol would increase.
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.