Oceans or large bodies of water. During the Ordovician period no creatures were above the water yet.
They're both extinct bony fishes. The difference is that ostracoderms were jaw-less and placoderms had jaws.
Ostracoderms were ancient fish with an an armor of bony plates. However, your question is very muddled and therefore we can not answer it properly.
They were jawless fish that lived during the Paleozoic era Stunningly some of our oldest ancestors came from ostracoderms!
yes
Ordovician Period
Ostracoderms were a group of extinct jawless fishes that lived from the late Cambrian to the end of the Devonian period. They were characterized by their bony armor covering their bodies, lack of jaws, and typically, had a cartilaginous skeleton. Ostracoderms are considered to be among the earliest vertebrates.
Yes that is true as sloss
primtie finsJAWSOstracoderms were jawless fishes with bony armor that protected them from predators.
The development of bone was an important evolutionary step. Bone provides a place for muscle attachment, which improves locomotion.
Agnatha, also known as jawless fish, are the oldest vertebrate fossils with no jaws. This group includes ancient species like the ostracoderms and the agnathan fish.
Lampreys are in the superclass Agnatha, jawless fish. They are of the class Cyclostomata, which includes hagfish, as opposed to the extinct Ostracoderms.
The genus of old red sandstone fish-like creatures is known as Ostracoderms. These ancient jawless fish lived during the Paleozoic era and are characterized by their bony outer covering.