Mollusks possess all of the following except which anatomical feature?
a. Foot
b. Mantle
c. Visceral mass
d. Notochord
e. Heart
Answer: d. Notochord
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Increased rate of photosynthesis is the most likely explanation as to why atmospheric CO2 levels appear lowest during glacial periods of Earth's history
A. true B. false
The nuclear envelope is perforated by _______________________
a. plasmodesmata b. gap junctions c. nuclear pores d. none of the above
A control group differs from an experimental group
A. in the number of test organisms used. B. by the independent variable. C. in several ways. D. in no way.
Most of the lymph fluid is returned to the bloodstream through the thoracic duct to the
A. left atrium of the heart. B. right atrium of the heart. C. right ventricle of the heart. D. left subclavian vein. E. right subclavian vein.