Muaj pes tsawg hemicordates?

Cov txheej txheem:

Muaj pes tsawg hemicordates?
Muaj pes tsawg hemicordates?

Video: Muaj pes tsawg hemicordates?

Video: Muaj pes tsawg hemicordates?
Video: Yog muaj 5 yam no ua pes tsawg lub hom phiaj los yeej tiav 2024, Kaum ib hlis
Anonim

Muaj 130 yam piav qhia ntawm Hemichordata thiab ntau hom tshiab tau raug tshawb pom, tshwj xeeb tshaj yog nyob rau hauv hiav txwv tob.

Hemichordates pom nyob qhov twg?

Hemichordates pom thoob plaws ntiaj teb cov dej hiav txwv, nrog cov lej tshaj tawm tshaj plaws los ntawm cov cheeb tsam nrog cov chaw sim dej hiav txwv thiab mob siab rau kev siv zog (xws li North Pacific thiab North Atlantic). Pterobranchs muaj ntau nyob rau hauv Antarctica, tab sis kuj tau pom nyob rau hauv qis latitudes.

Hemichordates yog dab tsi?

Ntxiv rau peb cov chav kawm uas tseem tshuav ntawm Hemichordata, muaj cov chav kawm uas ploj lawm, Graptolithina, paub los ntawm cov pob txha pom hauv pob zeb sib tham los ntawm Ordovician thiab Silurian lub sijhawm (505–410 lab xyoo dhau los).

Hemichordata tshwm sim thaum twg?

Abstract. Hemichordata yog phylum ntawm marine deuterostome tsiaj, feem ntau suav hais tias yog cov viv ncaus pawg ntawm echinoderms. Lawv tshwm sim hauv qis lossis nruab nrab Cambrianthiab suav nrog ob chav kawm tseem ceeb: Enteropneusta (acorn worms), thiab Pterobranchia.

Puas yog Hemichordates tshwj xeeb hauv marine?

Cov hemichordates yog pub dawb nyob cov leeg nqaijuas tsuas yog dej hiav txwv. Lawv muaj feem cuam tshuam nrog chordates tab sis tsis muaj notochord.

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