Small lakes and ponds usually lack a profundal zone
____________________ Indicate whether the statement is true or false.
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Molecular clocks are based primarily on rates of
A. neutral mutations. B. favorable mutations. C. detrimental mutations. D. natural selection. E. phylogenetic trees.
Which of the following kinds of fungi is NOT an ascomycete?
A. cup fungi B. yeasts C. morels D. truffles E. bread mold
Four of the five answers represent events that occurred when free oxygen (O2) became available in the atmosphere. Select the exception
a. aerobic respiration emerged. b. some organisms changed their metabolism. c. some species that could not detoxify free radicals became restricted to the low-oxygen environments that remained. d. oxygen was toxic to many species and some cells and forms of life became extinct. e. photosynthesis was no longer a common form of energy production.
The only source of all new alleles is:
a. natural selection. b. genetic drift. c. gene flow. d. mutation. e. genetic polymorphism.