Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
A、hostile-lookingInsectpestsareamongtheleadingcausesofcropfailure.
Bythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.
Someseaurchins海胆havevenomous(toxin)spines
TheeconomyofDallas,Texas,isstronganddiversified.
