MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.