Four features help define __________: a notochord,
a dorsal hollow nerve cord, a pharynx with gill slits,
and a tail extending past the anus. Fill in the blank(s) with the appropriate word(s).
Answer: chordates
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Of the following organisms, which has a unique developmental life cycle including a replicative form, the reticulate body (RB), and an extracellular, metabolically inert, infective form, the ele-mentary body (EB)?
a. Rickettsia b. Chlamydia c. Ehrlichia d. Coxiella
The atrioventricular valve(s) is/are located ____
a. between the left atrium and the left ventricle only b. between the right atrium and the right ventricle only c. where blood enters the aorta d. where blood enters the pulmonary arteries e. between the left atrium and the left ventricle, and between the right atrium and the right ventricle
The most primitive of the current reptiles based upon
the time of divergence from the stem reptiles are the a. crocodiles. b. snakes. c. tuataras. d. lizards. e. turtles.
he cell theory states that all living organisms:a
grow and develop. b. respond to stimuli. c. are composed of basic units called cells. d. can move from one place to another in order to find food or to escape predators. e. can form a population of organisms that is able to adapt to the environment.