Creosote bush clusters have been shown to be descendant from single seeds that germinated
a. in mesic environments.
b. 9,000 to 11,000 years ago.
c. from asexual reproduction.
d. from a drought intolerant genotype.
e. after being ingested by herbivores and deposited in feces.
B
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Which of the following antibiotics is produced by bacteria in the genus Streptomycetes?
A. Chloramphenicol B. Tetracycline C. Vancomycin D. All of the choices are correct.
Which of the following relationships is accurate?
a. insects: Malpighian tubules: urea as major nitrogenous waste
b. annelids: protonephridia: ammonia as major nitrogenous waste c. freshwater fish: kidney: large volume of hypertonic urine d. sharks: kidney: large volume of hypotonic urine e. earthworm: kidney: ammonia as major nitrogenous waste
Bright coloration in birds makes them stand out to predators. In female birds that sit on the nest, bright coloration is rare. This is likely the result of
A) artificial mutations. B) natural selection. C) stabilizing selection. D) coevolution. E) gene flow.
The cochlea is
A) a coiled structure found in the inner ear. B) part of the organ of Corti. C) involved in the maintenance of body temperature. D) part of the middle ear.