The primitive Earth's atmosphere contained gases produced by
A. outgassing by the Earth's interior.
B. gravitational energy.
C. radioactivity.
D. All of the choices are true.
Ans: A. outgassing by the Earth's interior.
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A wholphin is a rare hybrid animal born from mating a female bottlenose dolphin with a male false killer whale. Wholphins are diploid. Interestingly, wholphins are fertile. What can you conclude from the fact that wholphins are fertile?
A. Wholphins are allotetraploid. B. Dolphins and false killer whales likely have the same number of chromosomes C. Dolphins and false killer whales are actually the same species. D. One of the parents must have been aneuploid.
Bacterial DNA has how many origins of replication?
A. 0 B. 1 C. 10 D. Depends on the size of the DNA
Heartburn is usually caused by the
A) secretion of acid by the lining of the lower esophagus. B) reflux of chyme from the stomach into the lower esophagus. C) retention of food at the bottom of the esophagus by a sphincter that is reluctant to open. D) irritation of the lower esophagus by substances in spicy food.
True or False: The following list is in increasing order of complexity: cell, community, guild, population, and ecosystem
a. TRUE b. FALSE