Yes , mammals are part of chordate groups . Class mammalia is included in group Tetrapoda and they are part of vertebrata which is sub phylum of Chordata .
chordate phylum
that
Amphibians are part of the kingdom Animal. Same worms and humans. To narrow it down, they are part of the Phylum Chordate.
Oocytes
Being 'chordate' means that the animal has a backbone.
I do not know to be honest, sorry.
Yes, all chordates have a nerve chord running down their back and an earthworm has a nerve chord running down it's back therefore it is a chordate
no
oocytes
ovum(secondary oocytes)
no