Organisms don't all reproduce the same way. however, by comparing the of these organisms, many similarities between them are revealed. these similarities suggest that they're linked. this type of study is called developmental biology.

B)Embryos, evolutionary

I hope this helps.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

there really is life in the deepest part