When you of creatures, . But are . have been through the 's oceans for 450 — 200 , and by 100 .
When Did ?
The back to around 385 . These - , such as Archaeopteris, to across during the Devonian . Before that, the was with - , , and — that could be a .
, , had been in the oceans by the those . back to the Ordovician , around 450 .
of Five
's , there have been five — when all on were . The most of these is the that the , around 66 .
all five of them. While other were from the , . They the , the , and of other creatures that no .
What So ?
are for . Their are . Unlike most , have — , more , and to . This them to .
also have . They can by other — a — which them to or . Their of is ; some can a of in an - .
,
Despite every the has at them, now a : . , , and have to . that over 100 are by every .
A that has and five may in the . will this and very - .