Eyespots, the most rudimentary eyes, are found in protozoan原生动物 flagellates 鞭毛虫 , flatworms 扁形虫 , and segmented worms片段 蠕虫 .
A、hostile-lookingC
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Insect pests are among the leading causes of crop failure.
Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
Withtheacquisitionofsmallercompaniesbylargerones,the1960'ssawawaveofnewconglomerates.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
Some sea urchins海胆 have venomous (toxin) spines
