What is the group of marine mammals most adapted to the marine environment?

a. Pinnipeds
b. Otters
c. Cetaceans
d. Sirenians


c

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology