There is lots of evidence for a common ancestor but I suggest you look at wikipedia's evidence for common descent or Talk origins 29 evidence for evolution.
Scientists have identified Luca as the Last Universal Common Ancestor, or the common ancestor of all living organisms. Evidence for Luca comes from the study of genetic material and the similarities found in the genetic code of different species.
Various types of evidence, such as fossil records, comparative anatomy, molecular biology (DNA sequencing), and biogeography, all support the theory of common ancestry among organisms. These sources provide clues that organisms share a common evolutionary history and have descended from a common ancestor. Comparing these pieces of evidence across different species helps scientists infer relationships and trace the evolutionary trajectory of life on Earth.
all organisms share a common evolutionary ancestry. The universal presence of DNA suggests a common genetic code that has been inherited from a common ancestor. This supports the theory of evolution and the idea that all living things are connected through a shared genetic history.
The common ancestor of mammals and birds was a reptile.
Yes, plants and animals share a common ancestor.
There has been no evidence of such an ancestor.
Scientists have identified Luca as the Last Universal Common Ancestor, or the common ancestor of all living organisms. Evidence for Luca comes from the study of genetic material and the similarities found in the genetic code of different species.
Mollusks and segmented worms have a one-way digestive system, a separate mouth and anus, and their larvae are very similar. This is the best evidence that they have a common ancestor.
Many protista contain chloroplasts.
Physiological similarities suggest the species evolved from the same ancestor.
Rape
Homologous structures indicate a common ancestor
The DNA genetic code provides the best evidence of the common ancestry of life. Science has shown that there are many similarities between DNA sequences.
All vertebrate embryos look roughly the same, showing that they come from a common ancestor.
The common ancestor is the Hyracotherium
Various types of evidence, such as fossil records, comparative anatomy, molecular biology (DNA sequencing), and biogeography, all support the theory of common ancestry among organisms. These sources provide clues that organisms share a common evolutionary history and have descended from a common ancestor. Comparing these pieces of evidence across different species helps scientists infer relationships and trace the evolutionary trajectory of life on Earth.
Virtually everything about them, from their morphology to their embryological development to their behaviour to their genomes.