Mary Allen
Crustaceans belongs rau phylum Arthropods nrog rau kab, millipedes, thiab arachnids. Qee zaum lawv kuj hu ua crustaceans. Yuav luag txhua tus ntawm lawv nyob hauv hiav txwv lossis hauv dej tshiab. Muaj tag nrho ntau dua 50,000 hom tseem muaj sia nyob. Tseem muaj ntau cov pob txha.
Cov qog nqaij hlav txawv heev uas nws nyuaj rau piav qhia lawv ua ke. Cov kws tshawb fawb kuj tsis pom zoo li cas cov tsiaj sib txawv muaj feem cuam tshuam rau ib leeg raws li evolution. Lawv txhua tus muaj peb yam nram qab no: Lawv ua pa los ntawm gills thiab muaj ob khub ntawm cov kav hlau txais xov ntawm lawv lub taub hau. Lawv kuj nteg qe, los ntawm cov larvae tsim, thiab tom qab ntawd cov neeg laus tsiaj.
Crab feem ntau muaj tsib khub ob txhais ceg. Nyob rau hauv ntau lub roob ris, cov ceg pem hauv ntej tau hloov mus ua tus pincers muaj zog. Cov no feem ntau yog qhov sib txawv.
Crayfish ua haujlwm tseem ceeb hauv qhov xwm txheej: lawv ntxuav cov dej. Lawv tuaj yeem lim tawm cov kab mob thiab lwm yam tsiaj me thiab txawm tias co toxins.
Cov neeg noj qee hom crayfish, tshwj xeeb tshaj yog cws, crawfish, crayfish, thiab lobster. Peb hu cov crustaceans. Lawv yog ib feem ntawm cov nqaij nruab deg ntawm cov ntawv qhia zaub mov. Lawv feem ntau raug ntes hauv cov ntxiab. Cov no yog cov pob tawb tshwj xeeb uas crabs nyiam nkag mus rau hauv. Tom qab ntawd koj yuav tsis pom qhov tawm lawm. Ib txhia hom kuj bred los ntawm tib neeg.