00:04
So we know that there's lots of different kinds of fishes, and some of them are really similar, and some of them are drastically different.
00:11
So we're going to look at something that is common to all of them and things that are not common to all types of fish.
00:16
So one of your options is bony ray fins.
00:19
These are fins that are supported by bones, and the majority of fish that we think of will have bony ray fins.
00:27
However, you can think of things like eels that don't have bony rafins.
00:34
If they have a little bit of fin, it's, you know, very fluid and it doesn't have hard structures.
00:43
Bony appendages is a similar thing, right? eels don't have these bony appendages.
00:50
We can think of fish with jaws and fish without jaws.
00:54
You might think that all fish have jaws because pretty much all of them do.
00:58
However, there are some things like lamprey eels or...
01:04
Or any kind of blood -sucking fish don't have any jaws...