Indicate the reasons for evolution, reduced to the existing variety of species of vertebrates

The evolution of living organisms is a process that is possible due to the presence of certain driving forces. This is primarily possible due to hereditary variability. Beneficial mutations that arise in the body can be passed on to offspring and manifest in the entire population. Also, natural selection is an important part of evolution. Thanks to natural selection, weak organisms are sifted out from harmful mutations. The struggle for existence is included in the factors of natural selection and has three forms.