Biology Study Set 13
Quiz 26 :
Animal Evolutionthe Chordates
Ciona Savignyi (sea squirt) is known for its high population variation. High population diversity possesses several examples of hyper-diversity. According to National Human Genome Research Institute, non vertebrates are diverged from other chordates. These chordates illuminate the origination of chordates and development of vertebrates. Genome sequencing of the sea squirt provide evolution of the vertebrates and for phylum chordate. This is present in shallow waters of Japan.
Notochord is rod shaped and present in the embryos of chordates. Notochord is a flexible rod and present in embryos of chordates. This is composed of the mesodermal layer. While in some chordates, it remains throughout the life as support of the body. Hence, the correct option is (b). Most of the chordates are vertebrates (with backbone).Chordate have a notochord, dorsal stiffening rod and skeletal. Hence, option (a) is incorrect. All chordates have notochord, but may be present in adults. But jaws may or may not be present. Hence, option (c) is incorrect. Notochord and jaws, both may be available. Presence of jaws is derived features in chordates. This phylum possesses notochord, nerve cord and pharyngeal slits. Similarly jaws a Hence, option (d) is incorrect.
Fossils of mammals are left with the physical traits. This is consisted of bipedalism, fingers, face and teeth. These are mammalian features which resemble with feature of homos which means early humans with hard shelled nuts. They are carnivores due to the ability of tearing flesh and bones. The investigation of fossils crosswise over land time, how they were structured, and the evolutionary connections between taxa (phylogeny) are probably the most vital capacities of the art of fossil science. Such a saved example is known as a "fossil" on the off chance that it is more seasoned than some base age, regularly the discretionary date of 10,000 years.