Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
A、hostile-lookingSomeseaurchins海胆havevenomous(toxin)spines
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
