According to embryology, why do fish and birds have a common ancestor? O They both have embryos with gill slits and tails.
They both have embryos with traits that eventually disappear
O They both have embryos that develop into adults.
They both have embryos that form from a fertilized egg.

ucd e e. rr. t t t t t t. to

oxygen +1 most likely

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: