The latest major group of vertebrates to evolve were the birds, which evolved from dinosaurs around 155 million years ago.
No, frogs are not amniotes. Amniotes are a group of vertebrates that possess extraembryonic membranes, such as reptiles, birds, and mammals. Frogs belong to a different group of vertebrates called amphibians, which do not have these extraembryonic membranes.
Hen is to chicken as goose is to gander.
Because it gave them the ability to bite, which is a helpful tool for self-defense and hunting. No dictionary results were found. Please try another search. See results for uhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh on Reference.com
It either means your fish is sick or it's dying. There is a lot of reasons might it act like that. The few reason is ammonia with is bad, change the water.I have a fish like that and it layed at the bottom of the tank. But try to look up for the suggestions I gave you maybe it would answer your question but what kind of fish it is? Mine was a goldfish
Bony fish have a bony skeleton that provides more support and protection compared to the cartilaginous skeleton of cartilaginous fish. Bony fish also have a swim bladder, which helps with buoyancy control, allowing for more efficient swimming. Additionally, bony fish have scales that provide further protection against predators and environmental factors.
Mammals and birds are both descended from a group of vertebrates known as archosaurs. This group included early reptiles and gave rise to both dinosaurs (which birds evolved from) and the ancestors of mammals.
Green algae, specifically from the group Charophytes, are believed to be the protist functional group that gave rise to terrestrial plants. They share many structural and biochemical similarities with land plants, leading researchers to hypothesize this evolutionary relationship.
Lobe-fin fish
fish
The group of vertebrates that are most closely related to birds is reptiles.
10 and i wait 9 min to gave a fish food
It is a mammal, for it gave live birth. It was the ancestor of the modern day elephant.
Probably the discovery of the tadpole larva and the Larvacea group. They resemble the lancelet something awful. But the neoteny theory is discarded now - it´s thought some lancelets took on a sessile lifestyle and others gave rise to the vertebrates. And some just stayed lancelets, of course ;)
The stomach is not a recent evolutionary adaption. The first creatures to have stomachs developed billions of years ago in the early oceans. These were simple-celled organisms with specialized organelles that broke down the food absorbed from the environment and expelled the waste. (These are comparable to the human stomach and digestive track, just much simpler.) As these organisms became more and more complex through the forces of natural selection, so did their digestive systems. They eventually split and gave rise to aquatic insects (crustaceans), fish, octopi, mollusks, etc. The first creature with a stomach to walk on land was the aquatic insect, the ancestor of today's insects. Then came fish, led by the lobe-fin, which also had rudimentary lungs and limbs capable of bearing weight. Terrestrial fish gave way to amphibians, which gave way to reptiles, which gave way to birds and mammals. Mammals are vertebrates like cows, dogs, lions, horses, bears, and apes. Humans are descended from a line of proto-apes. Our modern stomach is therefore the result of billions of years of evolution. There are many overall similarities between the stomachs of various animals. This points to common ancestry. For more on the similarities (and differences) between fish, amphibian, and mammalian stomachs, see the paper linked below.
i gave a denomination to my pet fish today
When i wove a fish out of harakeke i gave it to my friend beacause she gave me her flax woven beehive
No, frogs are not amniotes. Amniotes are a group of vertebrates that possess extraembryonic membranes, such as reptiles, birds, and mammals. Frogs belong to a different group of vertebrates called amphibians, which do not have these extraembryonic membranes.