1.) describe specialized feeding structures of parasitic platyhelminths.
2.) some parasitic flatworms have a very complicated life cycle with more than one host. infer why this might be adaptive.
3.) how do free-living nematodes contribute to the carbon cycle?
4.)apply what you know about pinworms to develop one or more recommendations for preventing pinworm infections in humans.
5.) platyhelminths and nematodes are both worms. justify classifying them in different invertebrate phyla.

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.