branchiostoma is separated from starfish with presence of
Answers
Answer:
duudhdudhdudbdidhdifbf
Answer:
The lancelets (/ˈlænslɪts/ or /ˈlɑːnslɪts/), also known as amphioxi (singular: amphioxus /æmfiˈɒksəs/), consist of some 30–35 species of "fish-like" benthic filter feeding chordates [2] in the order Amphioxiformes. They are the modern representatives of the subphylum Cephalochordata. Lancelets closely resemble, and are believed to be related to, 530-million-year-old Pikaia, fossils of which are known from the Burgess Shale. Zoologists are interested in them because they provide evolutionary insight into the origins of vertebrates. Lancelets contain many organs and organ systems that are closely related to those of modern fish, but in more primitive form. Therefore, they provide a number of examples of possible evolution exaptation. For example, the gill-slits of lancelets are used for feeding only, and not for respiration. The circulatory system carries food throughout their body, but does not have red blood cells or hemoglobin for transporting oxygen. Lancelet genomes hold clues about the early evolution of vertebrates, by comparing genes from lancelets with the same genes in vertebrates, the change in gene function as vertebrates evolved can be discovered.[3] The genome of a few species in the genus Branchiostoma have been sequenced: B. floridae, [4] B. belcheri,[5] B. lanceolatum.