Over the last few decades, a startling number of frog, toad, and salamander species have spiraled toward extinction, though no one knows exactly why. both - amphibians and reptiles had evolved during the Palaeozoic era. Explain why scientists think that amphibians evolved from lobe-finned fishes. Yes, amphibians evolved before reptiles from fishes. why do scientists think birds have evolved from dinosaurs? A: Reptiles evolved from amphibians long before dinosaurs, about 300 million years ago. What are. Scientists think the first amphibians evolved from an ancestor of the lungfish (Figure 17.23). The endosymbiotic theory is the accepted mechanism for how eukaryotic cells evolved from prokaryotic cells.

(Page 1) - Reptiles (Including Dinosaurs) and Amphibians - Ask a Biologist Q&A - they had a large tail fin, lateral line canals on its head and large sharp teeth. However, amphibians rose in the Devonian period which was around 350–370 million years ago. The Poriferans are simple multi cellular animals.

The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the late Carboniferous period. They are known as Porifera. aquatic larva with gills. Amphibians. Answer to Many scientists think that birds evolved fromA mammal-like reptiles.B amphibians.C mammals.D dinosaurs.. In other words, any fossil we find today is only a tiny snapshot of what was actually alive 380 million years ago. Fossil evidence clearly shows that amphibians descended from one group of ancient fishes whose thick, bony fins gradually evolved into limb-like appendages. Ironically—considering that they evolved over 300 million years ago and have survived, with various waxings and wanings, into modern times—amphibians are among the most threatened creatures on the Earth today. amphibians?

The fossil and genetic evidence indicate that amniotes, such as reptiles, mammals and dinosaurs, shared common ancestry with amphibians. A lung. They do share some characteristics, but the lungfish has no hint of legs. It involves a cooperative relationship between two cells which allow both to survive—and eventually led to the development of all life on Earth. Sponges are very primitive creatures that scientist think evolved around 500 million years ago they both have similar skulls and vbertebral cololms.

Scientists believe this common ancestor existed 5 to 8 million years ago. Think of all the different kinds of amphibians we see today, and then imagine what this record would look like in 380 million years when only a tiny fraction of these species are preserved as fossils. Reptiles had a better breathing system than amphibians before them. What evidence suggests that Ichthyostega spent most of its time in the water?

Amphibians are ectothermic, smooth-skinned vertebrates, such as frogs and salamanders, that usually hatch as an.

Amphibians and reptiles 1.

Lungfish have lungs like most amphibians. They are stuck to the floor in the oceans, sea, and rivers. Amphibians• Amphibians are animals that can live in water and have lungs and legs• Scientists think that amphibians evolved from ancestors of lungfish-like fishes• Most of today’s amphibians are frogs or salamanders 2. The earliest forms of amphibians evolved from lobe-finned fish in the Devonian Period, around 350 million years ago. Question: Why do scientists think reptiles evolved from amphibians? Shortly thereafter, the species diverged into two separate lineages. Most evolutionary scientists today do not think that amphibians evolved from the lungfish.

Instead of a throat pump they moved their rib cage like we do, so the size of their lungs, not their mouth, determined how much air they could take in.