Ada sekitar 50.000 jenis hewan bert

Ada sekitar 50.000 jenis hewan bertulang belakang (vertebrata) yang diketahui sampai saat ini. Mereka hidup pada semua lingkungan biologi baik di daratan, air laut, air tawar, maupun udara. Walaupun bentuk dan ukuran tubuhnya beragam tetapi mempunyai struktur dasar tubuh yang sama. Hewan bertulang belakang umumnya terdiri dari kepala dan tubuh. Tubuh terdiri dari rongga dada dan abdomen. Hewan bertulang belakang yang hidup di darat biasanya mempunyai leher.

Tulang belakang berasal dari perkembangan sumbu penyokong tubuh primer atau notokorda (korda dorsalis). Notokorda vertebrata hanya ada pada masa embrionik, setelah dewasa akan mengalami penulangan menjadi sistem penyokong tubuh sekunder, yaitu tulang belakang (vertebrae).
Dalam sistem klasifikasi, vertebrata merupakan subfilum dari filum Chordata. Chordata meliputi hewan-hewan yang memiliki ciri-ciri sebagai berikut :
• Memiliki notokord, yaitu kerangka berbentuk batangan keras tetapi lentur. Notokord terletak di antara saluran pencernaan dan tali saraf, memanjang sepanjang tubuh membentuk sumbu kerangka.
• Memiliki tali saraf tunggal, berlubang terletak dorsal terhadap notokord, dan memiliki ujung anterior yang membesar berupa otak.
• Memiliki ekor yang memanjang ke arah posterior terhadap anus.
• Memiliki celah faring.
Vertebrata terdiri dari lima kelas yaitu pisces, amphibia, reptile, aves dan mammalia

Hasil (Inggris) 1:

There are about 50,000 species of backboned animals (vertebrates) that is known to date. They live on all environmental biology well inland, sea water, fresh water, or air. Despite his size and shape varied but have the same basic body structure. Backboned animals generally consists of head and body. The body consists of the abdominal and chest cavities. Backboned animal living on land usually has a neck.The spine comes from the development of the primary body axis or notochord (korda dorsalis). The vertebrate notochord exists only at the embryonic period, after which the adults will experience a penulangan system of secondary bodies, namely the spine (vertebrae).In the classification system, the vertebrate phylum Chordata subphylum is from. Chordates include animals that have the following characteristics:• Have a notokord, i.e. a framework in the shape of bullion hard but pliable. Notokord is located between the digestive tract and the nerve cord, extends along the body to form the axis of the framework.• Have a single, hollow nerve cord located dorsally on the notokord, and have an enlarged anterior tip of the brain.• Have a tail extending toward the posterior to the anus.• Have a pharyngeal slits.Vertebrates consists of five grades namely pisces, amphibia, mammals, birds and reptile

Hasil (Inggris) 2:

There are about 50,000 kinds of vertebrate animals (vertebrates) that are known to date. They live in all biological environment both on land, sea water, fresh water, and air. Although a variety of body shapes and sizes but have the same basic body structure. Vertebrate generally consists of head and body. The body composed of the chest and abdominal cavity. Vertebrate animals that live on land usually have a neck. The spine is derived from the development of the body axis of the primary backers or notochord (chorda dorsalis). Notochord vertebrates exist only in embryonic period, as adults will experience a reinforcement become a secondary backup system of the body, namely the spine (vertebrae). In the classification system, the vertebrate is a subphylum of the phylum Chordata. Chordates include the animals that have the following characteristics: • Have a notochord, which is rod-shaped skeleton hard but pliable. Notochord lies between the digestive tract and nerve cords, extending along the axis of the body forming the skeleton. • Have a single nerve cord, dorsal to the notochord hollow lies, and have enlarged anterior end in the form of the brain. • It has a tail that extends posteriorly to anus. • have pharyngeal slits. Vertebrates consists of five classes of Pisces, amphibia, reptiles, and mammals aves