DEAR TEACHER:.You tell us that when it comes to getting students excited about science "gross is great." In that case, "Parasites: As Gross As It Gets should be Just the ticket. Have students. read one of the most hair-raising articles Science World has published this year, which traces the life cycle of a lancet fluke fluke, parasitic flatworm of the trematoda class, related to the tapeworm. Instead of the cilia, external sense organs, and epidermis of the free-living flatworms, adult flukes have sucking disks with which they cling to their hosts and an external cuticle that and explains how one bizarre parasite parasite, plant or animal that at some stage of its existence obtains its nourishment from another living organism called the host. Parasites may or may not harm the host, but they never benefit it. enslaves female crabs. Our feature on global warming global warming, the gradual increase of the temperature of the earth's lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution. , "Climate Fever," offers a dramatic miniposter that pinpoints what climatologists now think are the six leading causes of a warming atmosphere--some of dioxide. And for a fresh look at basic physics, have students check out our feature on legendary skateboarder Tony Hawk
--The Editors e-mail: scienceworld @scholastic.com |
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