________ is characterized by unusually warm ocean temperatures in the eastern Pacific.
Fill in the blank(s) with the appropriate word(s).
El Niño
El Niño is characterized by unusually warm ocean temperatures in the eastern Pacific.
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Frozen water is more dense than liquid water
Indicate whether the statement is true or false
During peristaltic contractions which of the following is not moved from the small intestine to the large intestine?
a. Mucosal cells b. Water c. Active bacteria d. Undigested food matter e. Inorganic substances
Which of the following statements is true?
a. Organs receive either parasympathetic fibers or sympathetic fibers but not both. b. The sympathetic nervous system that supplies an organ will also provide parasympathetic fibers to it. c. Both the sympathetic and parasympathetic have either excitatory or inhibitory effects. d. The sympathetic branch of the sympathetic system usually speeds up the activities of the body. e. All of these are true.
Natural selection acts only on traits that are _____.
A. advantageous in a certain environment B. disadvantageous C. advantageous D. heritable