Which of these trees is different from the rest? Hint, don't panic by seeing the diagrams, this

Step 1: Examine the trees provided and mark each point where there is a branching to help visual

Which of these trees is different from the rest? Hint, don't...

Which of these trees is different from the rest? Hint, don't panic by seeing the diagrams, this is straightforward. Look at them for what they are and address the question. i. ii. iii. iv. None, they are all the same. After the K-T extinction, mammals filled many niches that had previously been filled with the newly extinct species. Now, mammals are prolific in most continents. This process is called: A speciation event An adaptive radiation The cambrian explosion Competitive exclusion The mammalian explosion

Transcript

00:01 Hey, stanley.

00:02 So to answer this question, i'm going to start by redrawing the four trees that were posted in this problem.

00:07 I'll begin over here.

00:09 These won't be the pretties, but i'll do my best.

00:21 So right here, you have the first tree.

00:24 Over here, we have the second.

00:38 The third is over here.

00:54 And last but not least, we have number four.

01:11 There we go.

01:12 All right.

01:12 These aren't exactly the cleanest again, but they get the job done.

01:16 So what i like to do in cases of dealing with trees like this is just for the sake of visual clarity, i like to mark each point where there is a branching.

01:27 So places like this or here, here, and here.

01:38 And i find that this just really helps with kind of when you're grouping each of these letters later on.

01:46 Helps you visualize just how to categorize each branching and the members within each branch.

01:55 So next step would be to take a look at this from what i call top down, or basically start from the most recent all the way down to the oldest.

02:08 So in each case, what i will do here is note that the two most recent members, d &e, all branch off from one common ancestor in every single scenario.

02:22 And both d &e are always the most recent instances.

02:26 So to highlight that, what i'm going to do is i'll just draw a circle around each case of d &e just to make it easier to keep that in mind.

02:43 And so what we do from here onwards is we just kind of scale backwards.

02:47 We see, okay, so next point of divergence that the group d and e eventually break off from? what's the other letter that branches off from that same point? and so we see in all cases, that very letter is c in every single case.

03:06 C is what branches off from this next common point that these all share.

03:10 C is also the same here.

03:12 C is the same here.

03:14 And also c is the same here.

03:16 Great.

03:17 Then we move on to the next one where we see that, oh, b is the next diverging pathway from this point where the rest of what we've circled here in green all branch off of.

03:29 And that's the same across every single tree instance here.

03:33 So i'll circle those.

03:36 So all of these now belong to this big sort of green mega group.

03:40 And so we see, okay, what's the last letter that this green megagroup branches off from with a common ancestor? and we see that that is a.

03:52 So having worked our way down this tree from youngest to oldest, we see basically, despite the fact that some of these might be oriented or arranged a bit differently, that there's fundamentally no difference between, say, one, two, three, or four.

04:06 All of these are, as i say, identical.

04:10 There's no fundamental difference between any of these...

Question

Please give Ace some feedback