The skull, for example, is made up of several bones that are fused together to form a protective shell around the brain. The bones of the frog's body are divided into different sections. The skeletal system of frogs is modified compared to that of other vertebrates to allow for two types of movement: swimming and jumping. If you want to learn more about frogs, do not miss this other article where we talk about how frogs reproduce. Their skeleton, that tends to be cartilaginous in the larval stage, becomes bony.Their hind legs begin to grow, eventually becoming fully formed legs.They develop lungs that allow them to breathe air.They develop special glands that secrete mucus to keep its skin moist.Their skin thickens and becomes more durable to protect it from the elements.These are some of the adaptations that frog tadpoles develop to live on land: As the tadpoles grow and develop, they undergo metamorphosis, a process in which they transform into adult amphibians. These tadpoles breathe through gills and have a fish-like appearance, with a long tail and no legs. They lay their eggs in water, and the eggs hatch into aquatic larvae called tadpoles or larvae. ![]() In the early stages of their life cycle, amphibians usually live exclusively in water. These adaptations include changes in the skeleton and overall body structure. Metamorphosis is a series of developmental changes that transform the aquatic, gill-breathing larvae, or tadpoles, into the air-breathing, land-dwelling adults. In addition, their bones became light and porous, allowing them to adapt to a semiaquatic lifestyle. They also developed strong, muscular legs that allowed them to move quickly and efficiently on land. But that was not the only change they had to make in order to settle on land. One of the most important adaptations was the development of moist, permeable skin that allowed them to breathe through their skin, reducing their dependence on water for respiration. ![]() These primitive frogs developed new adaptations that enabled them to live exclusively on land. The evolution of frogs from their fish-like ancestors began about 360 million years ago, in the Devonian period. Many amphibians, including frogs, toads, and salamanders, are adapted to life in water as well as on land, and are therefore often referred to as "semiaquatic" or "amphibious" animals. Like other vertebrates, the body of frogs is supported by a skeleton of bones that provides structure and support to the body and protects the internal organs. ![]() Frogs are classified as amphibians, a class of vertebrates that also includes salamanders and reptiles.
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