What is the group of marine mammals most adapted to the marine environment?
a. Pinnipeds
b. Otters
c. Cetaceans
d. Sirenians
c
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Homo erectus has been shown to have dispersed from
A. Africa. B. Asia. C. South America. D. Europe. E. North America.
During every energy transformation, it can be said that ____
a. the entropy of the universe increases b. the entropy of the universe decreases c. there is an increase in the free energy of the universe d. there is a change in the total energy of the universe e. the system becomes more organized
Why do phospholipids form sheet-like cellular membranes, despite being partly hydrophilic?
a. The modified phosphate group forms covalent bonds with adjacent phospholipids in a sheet-like configuration. b. Cellular membranes form at the water’s surface, with hydrophobic fatty acids extended into the air above. c. The long fatty acid chains weave together like a tapestry, pulling the phosphate groups together in sheets. d. Only the phosphate group can interact with water; fatty acids are forced together in the middle of double sheets.
Which of the following adaptations would NOT increase the surface area of a respiratory surface?
a. skin folds on an amphibian b. a flatworm having a broad, flat body c. branched gill filaments d. internal folds within lungs e. endothermy