Together, the stomach, intestines, mouth, and esophagus form a(n)
A) ectotherm.
B) organ system.
C) cell.
D) organ.
E) tissue.
B
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The term amphipathic describes the characteristic of some molecules that have ________.
A) two polar regions B) only a single polar region C) both a polar and a nonpolar region D) no polar regions E) two nonpolar regions
In aquatic animals, the most disadvantaged in terms of respiratory media are those living in ____
a. cold saltwater b. cold freshwater c. warm saltwater d. warm freshwater e. warm brackish water
Arrow "B" points to a structure that
a. is one of the four exclusive features of chordates. b. extends anteriorly into the head region. c. provides support for muscle contraction. d. is replaced in most adult vertebrates by the vertebral column. e. includes all of these
Which of the following is classified as a trace element in the human diet?
a. potassium b. iron c. sulfur d. magnesium e. sodium