Speciation.
that species today look different from their ancestors
Scientists can learn more about ancestors of different species and organisms by looking at fossil records and observing related species that are alive today.
No, humans and dogs have evolved from different ancestors, they are completely different species.
Humans and their human-like ancestors are called hominins. This includes species such as Homo sapiens (modern humans) and other related species that have characteristics similar to humans.
Convergent evolution. It occurs when different species independently evolve similar traits in response to similar environmental pressures, even though they do not share a common ancestor.
Homologous structures.
some species have same number of charosomes but they are different because Fusion is a common way for animal species to end up with a different number of chromosomes from their ancestors.
Sorry, no they aren't. They are a totally different species.Felidae (Felines)and Canidae (dogs)There are many different sub-species though.
Humans and their prehuman ancestors are collectively referred to as hominins. Hominins include extinct species closely related to humans as well as modern humans.
the ginko living species look similar to its fossil ancestors
ancestors
No. Fossils of possible platypus ancestors indicate that, if it did indeed have other ancestors, they shared the same characteristics it has today. No other species have been described.