[ 243 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Refer to the following passage to answer the next two questions. Veterinary clinics often treat pets with illnesses resulting from parasitism. Three common parasites diagnosed in dogs are the dog flea, deer tick, and Cheyletiella mites. Dog fleas and deer ticks both feed on the host animal’s (dog’s) blood, and can transmit diseases to the host animal through their bites. Dog fleas lay their eggs on the host animal’s body, and can survive on the host animal or on surfaces the animal comes in contact with, such as bedding. Deer ticks lay their eggs on the ground and attach to the host animal only while feeding. Cheyletiella mites live within and feed on the keratin layer of the host animal’s skin. Cheyletiella mites reproduce on the host animal, and can survive away from the host animal for only short periods of time. According to the passage, all the dog parasites gain which benefit from their symbiotic relationships with the host dogs? A. a habitat for living B. a vector for disease C. a source of nutrients D. a site for reproduction A veterinary technician is preparing to examine a dog suspected of having Cheyletiella mites. Which precaution would most effectively prevent the transmission of mites to other animals in the clinic? A. administering a vaccine to the infected dog B. wearing disposable gloves while examining the dog C. avoiding contact with open wounds on the dog D. sterilizing the exam room prior to examining the dog