As many bacterial molecular sequences evolve quickly and/or continuously, creating a bacterial phylogenetic tree based on molecular sequences can be difficult
A. true
B. false
A
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What might be the outcome of repeated duplications of one or a few genes in a species' genome?
A) tetraploidy B) semisterility C) the presence of gene families D) repetitive DNA that is of no use to the cell E) fusion of segments of two chromosomes into one
Which of the following organisms has the simplest digestive system?
a. earthworm b. jellyfish c. grasshopper d. clam e. more than one of these organisms has the simplest digestive system
The type of behavior that does not require learning or experience to be performed correctly is
A. classical conditioning. B. habituation. C. operant conditioning. D. imprinting. E. innate behavior.
Which of the following are true of trash?
a. Cigarette filters can persist in the environment for 10 years. b. Components of a disposable diaper will persist for 100 years. c. A plastic bag can persist for 50 years. d. Many animals are killed by consuming trash each year. e. All of these are true.