Don’t be alarmed, but you should be aware that right now, there is a species of mites, Demodex folliculorum, living in your eyelashes that are adapted to live on human skin and in human hair follicles, and nowhere else in nature. The good news is that these almost never cause any problems for their human hosts, and most are never even aware that they exist. What type of relationship do your eyelash mites share with you?
a. competitive
b. mutualistic
c. commensal
d. parasitic
c. commensal
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Which of the following comparisons of oviparity and viviparity is incorrect?
A. In viviparity, the mother has a lower metabolic investment in her young than in oviparity. B. Viviparity occurs in most mammals; oviparity occurs in birds. C. In viviparity, fertilized eggs are retained within the mother; in oviparity, the fertilized eggs are released into the environment. D. In viviparity, there is parental care; there is no parental care in oviparity. E. In viviparity, the fertilized egg does not need protection from dessication; in oviparity the fertilized egg often needs protection from dessication.
What structures do barnacles use to capture their food?
a. antennae b. shells c. legs d. heads e. siphons
Which of the following, if successful, always results in a complete cessation of trade in a certain product?
a. an import quota b. an embargo c. a trading bloc d. a voluntary restraint agreement
Similar cells that perform a particular function are known as
A) organisms. B) tissues. C) organs. D) organ systems.