After an initial rapid rise in the number of species on Earth, there was a plateau that experienced very little fluctuation in the number of species.
Answer the following statement true (T) or false (F)
False
Although the number of species experienced a leveling off period between 250 mya to 450 mya, there were fluctuations in the number of species that resulted in periods of mass extinctions.
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Human chromosome banding patterns match most closely those of
A) chimpanzees. B) monkeys. C) gorillas. D) orangutans.
Ammonia is produced when cells break down
a. fats. b. amino acids. c. carbohydrates. d. nucleic acids. e. vitamins.
Write a one-sentence explanation for the role of each of the following plant hormonelike signaling molecules: methyl
salicylate and jasmonic acid. What will be an ideal response?
What is the term used to describe segments of eukaryotic pre-mRNA that are removed in the final synthesis of mature mRNA?
A. introns B. promoters C. exons D. terminator