Vertebrates are animals with a backbone that have gradually developed diverse ecological types and morphological characteristics during the long process of evolution. Based on fossil records and biological research, it is currently believed that the evolutionary sequence of vertebrates is as follows:
1. Fish: About 500 million years ago, the earliest vertebrates appeared. They were some fish, such as ascidians, echinoderms, etc.
2. Amphibians: About 360 million years ago, some fish began to develop on land and gradually evolved into amphibians, such as salamanders, frogs, etc.
3. Reptiles: About 310 million years ago, some amphibians began to evolve into reptiles, such as dinosaurs, crocodiles, etc.
4. Birds: About 150 million years ago, a branch of reptiles evolved into birds, becoming a highly evolved animal.
5. Mammals: About 200 million years ago, mammals began to appear as a group and gradually evolved into diverse forms and ecological types, such as carnivores, rodents, primates, etc.
It should be noted that the evolution of vertebrates is a long and complex historical process, producing a variety of species in different periods and environments. At the same time, there are also close connections and interactions between different taxa, which provide important references for us to understand the origin and evolution of life.
animal tags：
you may also like
Elk is China's national treasure and a rare animal unique to China. The following is a detailed introduction to the elk as a national treasure of China:The background of elk as China’s national treasure:Classification and characteristics:Elk, scientific name "Elaphurus davidianus", is...
When kittens get lost, here are some common places they may hide: 1. Grass or bushes near your home: Kittens may find grass or bushes close to their home to hide and feel safe. 2. Neighbor’s Garden or Yard: Kittens will sometimes find their way into...
Humans are mammals, and mammals are warm-blooded animals that can maintain a relatively constant internal temperature regardless of the ambient temperature. Body temperature control is an example of homeostasis, the self-regulatory process of an organism that tends to maintain internal stability whi...
When we think about fish, we often picture them swimming gracefully through the water, but some fascinating species have taken a leap—literally—into a more terrestrial lifestyle! These remarkable fish have evolved legs that not only allow them to navigate on land but also to find and taste buried...
Congratulations on your decision to get a Golden Retriever. They are very smart, friendly, lively and loyal dogs. Here are some things you need to pay attention to when raising a golden retriever for the first time:1. Give good nutrition: Golden retrievers need high-quality food to meet their energy...
Male cats can have some negative behaviors and health problems if they are not neutered. Here are some possible scenarios:1. Roaming in search of mates: When male cats reach estrus, they will often roam in search of mates, which may lead to injuries, diseases, loss, or attacks by stray cats outdoors...
Meerkats are a wild animal and breeding them can be challenging for non-experts because of their special needs and wild instincts. Here are some basic principles and considerations for meerkats farming: 1. Legal and Licensing: - Before considering breeding meerk...
During hibernation, frogs stop eating and slow down their metabolism to survive the cold winter. When a body of water is covered with ice, some frogs slumber underwater, while others spend their hibernation period on land in caves or dark, damp places. During hibernation, frogs requ...
Email: jsset#163.com (change # to @) Please indicate your purpose of visit! Guangdong ICP No. 2022053326 XML| map| Chinese
