Which action is an example of voluntary muscle contraction?
A) a push-up
B) peristalsis
C) a heartbeat
D) stomach churning
A
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Which feature of amphibians makes them more susceptible to environmental toxins and pollutants than other animals?
A. thin, permeable skin B. small size C. preference for aquatic environments D. insectivorous diet E. small lungs
A study of certain nuclear genes in humans and chimpanzees shows that the two species differ in 5 percent of their DNA bases. Base substitution mutations occur at a rate of 1 percent per one million years. How many million years ago did these species diverge?
A) 0.5 B) 1 C) 3 D) 5
Which of the following types of organisms uses inorganic molecules as an energy source?
a. photoautotrophs b. chemoautotrophs c. net primary producers d. net primary consumers
Fossil evidence suggests that the latest possible date for root of the universal phylogeny predates the ________ billion-year mark
Fill in the blank(s) with correct word