The Species That Broke Evolution?
Summary
TLDRThis video from MinuteEarth challenges the notion of 'living fossils,' explaining that all species evolve over time due to genetic mutations. While some, like gars, evolve slowly, others like the tuatara have rapidly mutating genes. The video illustrates that the rate of evolution varies, and even 'living fossils' like coelacanths and horseshoe crabs show subtle changes, emphasizing the continuous process of evolution. It concludes with a personal anecdote on skill development through Skillshare, highlighting the importance of change for personal growth.
Takeaways
- š The concept of 'living fossils' is challenged; species like gars, horseshoe crabs, and coelacanths, once thought to be evolutionarily static, are actually changing, albeit at different rates.
- š¬ Charles Darwin's notion that certain species are 'frozen in time' is incorrect as all species undergo evolution due to genetic mutations over time.
- š§¬ Genetic mutations are a biological rule, occurring randomly as individuals reproduce, with some mutations aiding survival and reproduction, while others are detrimental and do not persist.
- š Gars, a type of predatory fish, have a remarkably slow rate of genetic mutation compared to most vertebrates, which contributes to their slow evolution.
- š¦ Despite their slow evolution, gars can still interbreed with closely related species that shared a common ancestor over 100 million years ago, resulting in fertile offspring.
- š¦ Horseshoe crabs and coelacanths do not evolve slowly; their genes mutate at a similar rate to most other animals, challenging the 'living fossil' label.
- š¦ The tuatara, another 'living fossil,' actually has the fastest evolving genes of any vertebrate studied, indicating rapid genetic change.
- š¦ The horseshoe crab's successful body plan may be so well-adapted to its environment that mutations leading to significant changes are less likely to be preserved.
- š Coelacanths have evolved in subtle ways that are not easily noticeable, such as differences in the placement of facial bones between modern and ancestral species.
- š¦ The tuatara's rapid evolution may be attributed to both its skeleton's subtle changes over time and its body shape's near-perfect adaptation to its burrowing lifestyle.
- š The video also promotes Skillshare as an online learning platform for creatives, offering classes that can help individuals level up their skills and productivity, as exemplified by the presenter's experience with Ali Abdaal's Notion masterclass.
Q & A
What is the term used to describe species that appear to have remained unchanged over long periods of time?
-The term used to describe such species is 'living fossils'.
Why did Darwin call certain species 'living fossils'?
-Darwin called them 'living fossils' because they seemed to be evolutionarily frozen in time, showing little change over millions of years.
What is a biological rule that all species must follow?
-All species must change over time due to the nature of genetic mutations and evolution.
How do genetic mutations affect an organism's survival and reproduction?
-Some genetic mutations can hurt an organism's ability to survive and reproduce, leading to their elimination, while others can help or not affect it, allowing them to persist.
Why do some species like gars evolve at a slower rate than others?
-Gars have genes that mutate thousands of times slower than most other vertebrates, although the exact reason for this is not fully understood by scientists.
How does the slow rate of evolution in gars affect their genetic similarity with other species?
-The slow rate of evolution allows gars to remain genetically similar to other species to the point where they can still interbreed and produce fertile offspring.
What is an example of a 'living fossil' that has genes that mutate at the same rate as most other animals?
-Coelacanths and horseshoe crabs are examples of 'living fossils' with genes that mutate at a rate comparable to most other animals.
Why might the physical appearance of some 'living fossils' like the horseshoe crab not change significantly?
-The horseshoe crab's body plan works exceptionally well in its marine environment, and mutations that significantly alter this form may reduce its environmental fit, leading to a return to the successful form.
How does the tuatara, another 'living fossil', differ from others in terms of genetic mutation rate?
-The tuatara has the fastest evolving genes of any vertebrate studied, which is a contrast to the slow mutation rates seen in other 'living fossils'.
What could be a reason for the tuatara's rapid evolution despite its seemingly unchanged appearance?
-The tuatara's skeleton is subtly changing over time, and its body shape appears to be perfectly adapted for its burrow-dwelling lifestyle, which might explain the rapid evolution.
Why might some changes in a species not be visible in the fossil record?
-Changes that occur internally, such as adaptations to new environments or physiological changes, may not be apparent in the fossil record and require more detailed examination to detect.
How does the video script relate the concept of 'living fossils' to personal development and learning?
-The script uses the concept of 'living fossils' to illustrate the importance of change and adaptation, both in nature and in personal growth, as exemplified by the host's experience learning Notion on Skillshare.
Outlines
š¦ Evolution of 'Living Fossils'
The video script introduces the concept of 'living fossils', species like gars, horseshoe crabs, and coelacanths that have remained seemingly unchanged for millions of years. It challenges the idea that these species are evolutionarily static, explaining that all species undergo genetic mutations over time, with some mutations aiding survival and reproduction. The script highlights that the rate of evolution varies among species, with gars evolving particularly slowly due to their genes mutating at a much slower pace. Despite this, they can still interbreed with other gar species that shared a common ancestor over 100 million years ago, unlike other species pairs mentioned for comparison.
Mindmap
Keywords
š”Living fossils
š”Evolution
š”DNA mutation
š”Gars
š”Coelacanths
š”Horseshoe crabs
š”Tuatara
š”Adaptation
š”Fossil record
š”Skillshare
š”Notion
Highlights
Sponsored video by Skillshare featuring the concept of 'living fossils'.
Ancestral species of humans, gars, horseshoe crabs, and coelacanths from 100 million years ago.
Darwin's incorrect notion of 'living fossils' being evolutionarily static.
Biological rule of species change over time due to genetic mutations.
Different rates of evolution among species, with gars mutating slowly.
Gars' slow mutation rate allows for genetic similarity and interbreeding with distant relatives.
Coelacanths and horseshoe crabs have mutation rates similar to most animals.
Tuatara, a 'living fossil', has the fastest evolving genes among vertebrates.
Horseshoe crabs' successful body plan may resist significant mutational changes.
Coelacanths have evolved with subtle changes in appearance not easily noticed.
Tuatara's rapid evolution includes skeletal changes and perfect body shape adaptation.
Species may evolve in ways not visible in the fossil record, such as physiological adaptations.
The concept that there are no true 'living fossils' and all life is in constant evolution.
Individuals, like species, must change to survive and thrive.
Personal growth through learning on Skillshare, specifically Ali Abdaalās Notion masterclass.
Skillshare as a platform for creative learning with classes across various fields.
Skillshare offering a one-month free trial for the first 500 users through a special link.
Transcripts
This video is sponsored by Skillshare.Ā More about them at the end of the video.
One hundred million years ago, theĀ ancestors of humans looked like this.
At the very same time inĀ history, the ancestors of gars,Ā Ā
horseshoe crabs and coelacanthsĀ looked like this, this, and this.
Darwin called species like theseĀ āliving fossils'' because theyĀ Ā
seem like they are evolutionarilyĀ frozen in time. But Darwin was wrong.
Hi, Iām David and this is MinuteEarth.
All species change over time: itāsĀ a biological rule āmostly due toĀ Ā
how genes work. As individualsĀ reproduce, DNA randomly mutates.
Some of these mutations hurtĀ the organism's ability toĀ Ā
survive and reproduce, so they donāt make the cut.
But others help ā or at leastĀ donāt hurt ā so they stick around.
Over time, mutations pile up, changing speciesĀ in all sorts of ways. Thatās evolution.
But evolution doesn't happen at the same rateĀ in all species. Predatory fish known as garsĀ Ā
have genes that mutate thousands of timesĀ slower than those of most other vertebrates,Ā Ā
although scientists donātĀ totally understand why that is.
So despite what Darwin thought, gars are changing,Ā theyāre just changing really really slowly.
In fact, even though the alligator garĀ and the longnose gar last shared a commonĀ Ā
ancestor more than 100 million years ago,Ā these fish evolve so slowly ā and thus areĀ Ā
still so genetically similar ā that theyĀ can still mate and make fertile offspring.
Thatās like if Chimpanzees and KangaroosĀ ā who also shared a common ancestor aroundĀ Ā
that time ā were able to make a baby. ForĀ the record ā that canāt actually happen.Ā
But not all so-called livingĀ fossils evolve slowly.
Coelacanths and horseshoe crabsĀ have genes that mutate at prettyĀ Ā
much the same rate as those of most other animals.
And the tuatara ā another so-called livingĀ fossil ā actually has the fastest evolvingĀ Ā
genes of any vertebrate studied. So why don'tĀ these animals LOOK like they're changing?
For the horseshoe crab, it seems thatĀ its particular body plan ā you know,Ā Ā
the classic domed shell and rudder-likeĀ tail ā just works super well in itsĀ Ā
marine environment ā and has for a long time.
It might be that every time mutationsĀ significantly change this body plan,Ā Ā
the crabs become slightly-less-well-suitedĀ Ā
to their environment, and future mutationsĀ end up bringing that successful form back.
The coelacanth, meanwhile, actually has beenĀ evolving in ways that do change its appearance;Ā Ā
it's just that the changes are so subtleĀ that most of us donāt notice them.
Like, if you look carefully at the skullsĀ of a modern coelacanth and its ancestor,Ā Ā
you can see that ā despite their incredibleĀ Ā
similarity ā their facial bones areĀ actually in very different places.
As for the tuatara, we're not totallyĀ sure why itā s evolving so quickly,Ā Ā
but it seems like both things are happening āĀ its skeleton is subtly changing over time AND itsĀ Ā
particular body shape seems to be almost perfectlyĀ adapted for its life in and out of a burrow.
And finally, a species could be changing in waysĀ that we just can't see in the fossil record.
For example, we know that some ancientĀ coelacanth relatives lived in freshwater,Ā Ā
so modern ones must have evolved in ways thatĀ helped them deal with excess salt and buoyancy.
So thereās no such thing as a living fossil.
Life on Earth is constantly evolving. ItāsĀ just that there are lots of ways to do that,Ā Ā
and for some species, the more thingsĀ change, the more they stay the same.
Species arenāt the only things that need to changeĀ in order to survive and thrive - individuals needĀ Ā
to, too. Since I didnāt want my abilities toĀ fossilize, I decided to level up my productivityĀ Ā
by taking Ali Abdaalās Notion masterclass onĀ Skillshare. Skillshare is the largest onlineĀ Ā
learning community for creatives with thousandsĀ of classes led by industry experts across film,Ā Ā
illustration, design, freelance, productivity,Ā and more. Seriously ā thereās even a class onĀ Ā
YouTubing taught by MKBHD himself. I loved AliāsĀ Notion class because it took me step-by-stepĀ Ā
through the steep learning curve of the softwareĀ that had stymied me in the past and brought me toĀ Ā
the point where Iām now using Notion to organizeĀ pretty much everything in my life. Skillshare canĀ Ā
help you take your career, skills, hobbies,Ā passions, or side hustles to the next level,Ā Ā
and each Skillshare Learning Path is aĀ curated, sequential collection of classesĀ Ā
designed to help you master a specific skill orĀ competency. The first 500 people to use the linkĀ Ā
in the description will receive a one monthĀ free trial of Skillshare! Get started today!
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