By various bacteria ingesting but not digesting other bacteria, most likely the precursors of mitochondria (and/or chloroplasts).
ampibians
Scientists think that archaea may be the group of prokaryotes that are most closely related to the ancestors of eukaryotes. This is based on genetic and biochemical similarities between archaea and eukaryotes, as well as the shared presence of certain cellular structures and processes.
90% of modern birds
Scientists think that penguins evolved from flying birds, similar to petrels and albatrosses, around 60 million years ago. Over time, they adapted to a more aquatic lifestyle, leading to their distinctive form and characteristics we see today.
because RNA depend to DNA.
Most evolutionary scientists today do not think that amphibians evolved from the lungfish. They do share some characteristics, but the lungfish has no hint of legs.
Scientists think that the first life forms appeared on Earth about 3.6 billion years ago. These were simple cells that eventually evolved into the abundance of life we see today.
They theorize that during this period the first of three gill arches on a jawless fish evolved into the first jaws.
DNA I think
endosymbiosis.
We do no know exactly what kind of lizard snakes evolved from, but scientists think it was related to monitor lizards.
Scientists think that all life evolved from the ocean, because that's where all life started. Animals come out of the ocean and through many generations, they get characteristics that help them survive.