00:02
Hi there.
00:03
In this question, we have a series of events from this chapter in the book.
00:08
And this chapter in the book is all about the evolution of animals.
00:12
So as we're putting these in order, it would make sense that the first one, so we're putting them in order from oldest to most recent.
00:23
So it makes sense that the very first one is going to be letter b.
00:27
We have the origin of animals.
00:36
This led the way for the rest of the time.
00:38
Topics in this chapter.
00:42
After that, next would be letter a, the cambrian explosion of diversity.
00:52
Most animal lines, most animal lineages came from this where many different animal lines developed over a very brief short of time.
01:03
And this was about 542 to 488 million years ago.
01:14
So this is when we saw most animal lineages develop, that cambrian explosion of diversity.
01:31
Moving in order, the next thing here of our options would be letter f.
01:37
We have the first vertebraes with jaws, the first jawed vertebraes.
01:48
So we have vertebrae with jaws.
01:53
These would be a couple of different lines of fish, the cart lineage's fish, and the bony fish.
01:59
Those were the first ones to have some jaws there...