The characteristic that first developed in reptiles is the a) Amniotic egg. The amniotic egg was one of the most important developments that allowed...
Which of these is NOT one of the characteristics of a vertebrate? The characteristics of vertebrates include segmentation, cephalization, closed circulation, and a coelom. Radial symmetry is not a characteristic of vertebrate.
Which of the following features are shared by all of the jawed fish? Cartilaginous endoskeleton, gills and scales.
Reptiles and amphibians also are both vertebrate animals, meaning they have backbones. Reptiles and amphibians also both have excellent eyesight that helps them hunt prey.
The vertebrate has a distinct head, with a differentiated tubular brain and three pairs of sense organs (nasal, optic, and otic). The body is divided into trunk and tail regions. The presence of pharyngeal slits with gills indicates a relatively high metabolic rate.
The earliest jawed vertebrates probably developed during the late Ordovician period. They are first represented in the fossil record from the Silurian by two groups of fish: the armoured fish known as placoderms, which evolved from the ostracoderms; and the Acanthodii (or spiny sharks).
The first jawed vertebrates may have appeared in the late Ordovician (~445 mya) and became common in the Devonian, often known as the "Age of Fishes". The two groups of bony fishes, the actinopterygii and sarcopterygii, evolved and became common.
Jawed vertebrates arose from non-jawed vertebrates that had a pharyngeal gill apparatus composed of gill bars and slits. Anterior gill bars evolved into the jaw, which supports structures in vertebrates.
Like all chordates, vertebrates have a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
All vertebrate digestives systems have the same basic plan. Food enters through the mouth and is usually broken into smaller pieces by teeth. Many vertebrates have a tongue that helps manipulate the food in the mouth. Most land vertebrates have salivary glands that lubricate the food and start the process of digestion.
From the given organisms, the Amphioxus is a chordate but not a vertebrate. Amphioxus, commonly known as lancelet, is a marine fish like chordate that possesses a dorsal nerve cord which is not protected by bone but by a simple notochord made up of a cylindrical cell pattern, closely packed to form a toughened rod.
Reptiles are a class of vertebrates made up mostly of snakes, turtles, lizards, and crocodilians. These animals are most easily recognized by their dry, scaly skin. Almost all reptiles are cold-blooded, and most lay eggs—though some, like the boa constrictor, give birth to live young.