The anatomical structure shown above is of
a. venous valves.
b. pulmonary veins.
c. the inferior valve.
d. the right myocardial sac.
e. the heart apex.
Answer: a
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a. glottis b. pharynx c. epiglottis d. larynx e. trachea
Which of the following is(are) NOT trend(s) of
vertebrate evolution? a. conversion of the support for locomotion from the notochord to the vertebral column b. expansion of the nerve cord to form the brain and spinal cord c. changes in the respiratory system from gills to lungs with accompanying changes in the circulatory system d. the development of fewer, more efficient chambers in the heart e. modification of limbs that allowed for more efficient movement
Which structure has cilia that create water currents
and mucous sheets that capture nutrients suspended in the water in filter-feeding chordates? a. notochord b. differentially permeable membrane c. filiform tongue d. gill slits e. jaw
The wide variation in skin color in humans is best explained by
a. environmental changes like improvements in diet. b. genetic drift. c. skin color is a polygenic trait. d. crossing over. e. artificial selection.