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As biologist Terrie Williams has documented, deep dives present a challenge for seals and other marine mammals. A seal must exert enough energy to propel itself hundreds of meters downward, while keeping its heart rate low enough that it doesn't run out of oxygen while underwater. For this reason, ________. \(\qquad
Reading and WritingExpression of Ideas
Organisms have evolved a number of surprising adaptations to ensure their survival in adverse conditions. Tadpole shrimp (Triops longicaudatus) embryos, ________ can pause development for over ten years during extended periods of drought.<br/><br/>Which choice completes the text with the most logical transition?
Reading and WritingExpression of Ideas
The number of dark spots that appear on the Sun, known as sunspots, can vary greatly. For example, there were about 180 sunspots in November 2001. ________ there were only about 2 sunspots in December 2008.<br/><br/>Which choice completes the text with the most logical transition?
Reading and WritingExpression of Ideas