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It is unknown what caused such evolution to occur. We do know that they evolved from some sort of lungfish. The ability for a fish to take oxygen from the air makes it easier to survive in water without much dissolved oxygen. Possible transitional fossils show animals with leg-like fins that could not support the animal's weight on land, but might have been useful for crawling along the bottoms of shallow lakes. The ability for a similar animal with stronger limbs to crawl onto land would have allowed them to escape predators and move to new bodies of water if conditions become unsuitable.
What else can I help you with?
Are all tetrapods air-breathers?
Yes.
How is homologous structures an example of evolution?
Though the forelimb of your cat or dog does not look much like your arms these are homologous structures that are almost identical bone for bone. This shows the common ancestry of all tetrapods and the closer common ancestry of you and your mammal pets.
Are curassows tetrapods?
Yes, curassows are tetrapods. Tetrapods are vertebrate animals with four limbs, and curassows fit this description as they belong to the order Galliformes, which includes birds with four limbs adapted for walking and perching.
What are tetrapods that live on land but still depend on water to survive and reproduce?
Amphibians
Generally evolution by natural selection occurs quite slowly over?
Evolution through natural selection occurs slowly over millions of years. It has been hypothesized that evolution is the result of positive mutations that occur in a community of organisms that help them survive better. Evolution is essentially descent with modification.
What did the ancestor of all modern tetrapods look like?
lizard The common ancestor of all modern tetrapods looked like a fish that had nubs the became limbs through evolution.
Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments?
The evolution of limbs with digits was the most significant innovation that helped tetrapods move onto dry terrestrial environments. This adaptation allowed for weight support, better mobility, and the ability to navigate various terrains.
Does evolution occur in individuals or in population?
Evolution occurs in population not in an individual.
Did evolution occur in the permian period?
Yes. Evolution ocurred in all geologic periods.
What are some draw backs of selective breeding?
You do not allow evolution to occur, for you are evolution in selective breeding.
How is variation related to evolution?
The more variation there is in a group of specimens, the more evolution can occur between them.
Why did evolution not occur in down syndrome?
Down Syndrome is a the addition of an extra chromosome and not really related to evolution. It is more of a genetic mutation that causes this event to occur.
How do variations occur?
During evolution, chromosomal cariation in structure cannot occur due to
When will convergent evolution occur?
It already has in some instances
What is a mechanism by which evolution can occur?
Selective Breeding of course!
For a mutation to affect evolution it must occur in?
For a mutation to affect evolution, it must occur in the DNA of reproductive cells (sperm or egg cells) so that it can be passed on to offspring. Mutations that occur in somatic cells (non-reproductive cells) do not directly impact evolution as they are not inherited by future generations.
Under what circumstances would evolution not occur if?
Evolution would not occur if there is no genetic variation within a population, no selection pressure, or if there is no reproduction and passing on of genes to the next generation.
