With a solid understanding of biology on the small scale under our belts, it’s time for the long view – for the next twelve weeks, we’ll be learning how the living things that we’ve studied interact with and influence each other and their environments. Life is powerful, and in order to understand how living systems work, you first have to understand how they originated, developed, and diversified over the past 4.5 billion years of Earth’s history. Hang on to your hats as Hank tells us the epic drama that is the history of life on Earth.
Table of Contents
1) Archaean & Proterozoic Eons 01:53
a) Protobionts 03:54
b) Prokaryotes 04:18
c) Eukaryotes 06:06
2) Phanerozoic Eon 06:42
a) Cambrian Explosion 06:49
b) Ordovician Period 07:36
c) Devonian Period 07:48
d) Carboniferous Period 08:13
e) Permian Period 09:10
References:
http://www.sciencedaily.com/releases/2010/08/100823113436.htm
http://forces.si.edu/atmosphere/02_02_06.html
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It’s pronounced IKEA
Me watching this series because I have a ecology test because it is a unit in my biology course:
Wow.
when it takes you an hour to watch a 13 minute video because you have to take notes for your school test but you don't know how to take notes shorter than a paragraph so you end up taking two minutes for each note and you have used 4 pieces of paper only 7 minutes into the video AND your handwriting is super small
This is on khan academy I am watching this on it
1
If you put the playback speed on 2x, it sounds like he's trying to rap 😂😂😄
4:13 emeinem hit different nowadays
Why mostly word comes from Greek letter??
When English is language spoken all around world
Is there anyone who'd like to answer
Very good explanation! But why you stated that: "… the nucleic acid was probably the first genetic material…"? Is there any doubt about it?
7:25 I see what you did there
Who else finds I'm super duper handsome?
I refreshed this page just to get an ad to support crash course, lol
great video!
mr green looks so young
ppigga
pp
pp
pp
AP ES Squad?
Mr.Johns class / Something i learned was a Niche is a combination of living and nonliving resources used to survive
Takes a lot of faith to believe that how earth came to be
More videos by hank please
Is Hank Green related to John Green?
Whoa. "Phosphlipids spontaneously form bilayer membranes in water". The implications…!
Y’all I’m watching crash course ecology for fun
explanetion why befor you get to ice age stock and eat one other
8
damaged rent house cycles
11:18 lmao who thought of ozzy and strut from the land before time
2:13 the picture does not correspond to reality. Its just an artistic depiction.
The History of Life on Earth – Crash Course Ecology #1 NOTES
1: Course Intro
1.1: Biology knowledge is assumed
1.2: Everything connects back to ecology
1.3: The history of life here eventually leads to humans, the most important species on Earth
2: Before Life on Earth
2.1: Humans are currently the dominant species on the planet, with different dominant species over time
2.2: Most of Earth’s history from its creation 4.6 billion years ago was devoid of life due to excessive heat, much of which remains in Earth’s core
2.2.1: Earth’s core continues to influence geology, albeit slowly
2.3: Water eventually cooled enough to turn into liquid
3: Start of Life on Earth
3.1: A “soup of chemicals” such as nitrogen, methane, and hydrogen formed in the oceans and atmosphere
3.1.1: Life started as these chemicals formed organic molecules, most likely just a collection of chemicals surrounding a membrane, called Protobionts
3.2: These chemicals turned into amino acids and, eventually, RNA
3.3: Protobionts continued to split until DNA nucleotides formed, leading to single-celled organisms
4: Single-Celled Organisms
4.1: The first single-celled organisms were prokaryotes during the Archaean Eon, from around 3.5-2.1 billion years ago
4.2: A type of prokaryote called cyanobacteria began to make its own food through photosynthesis, releasing oxygen into the atmosphere and opening the way for oxygen-breathing organisms
4.3: Eukaryotes evolved by endosymbiosis, where a symbiotic relationship between two prokaryotes led to the development of organelles such as mitochondria and plastids, allowing for much more complexity
5: Multicellular Organisms
5.1: The first multicellular organisms formed around 1.5 billion years ago, first as algae
5.2: The Cambrian Explosion 535 million years ago led to an evolutionary arms race as species known as Chordates developed skeletons, shells, claws, etc., resulting in the dawn of the Phanerozoic era
5.3: Around 500 million years ago, species left the oceans and colonized land in the Ordovician Period
6: The First Land-Based Species
6.1: 365 million years ago, tetrapods (essentially fish with legs at the time) and arthropods (spiders and insects) appeared in the Devonian period
6.2: Land-Based organisms changed ecosystems as they expelled carbon dioxide after inhaling oxygen, leading to the Carboniferous period around 359-299 million years ago where dense forests sprouted up
6.3: There was too much oxygen, leading to global cooling and the destruction and eventual fossilization of these forests, which are used in today’s fossil fuels
7: Pangea and the Dinosaurs
7.1: Around 299-251 million years ago, Pangea formed as one large continent during the Permian period, altering ocean currents and the climate
7.2: Modern ferns and pines, as well as archosaurs, showed up as a result of these geological changes
7.3: The Permian-Triassic Extinction Event resulted in the vast majority of species going extinct
7.3.1: Dinosaurs evolved during the Triassic as there was little competition for their niche from other species
7.4: During the Jurassic and Cretaceous periods from 199-65 million years ago, more complex dinosaurs evolved as herbivores, carnivores, and massive sea-going species, as well as small mammals, roamed the Earth
7.5: Around 65 million years ago, a major extinction event occurred where most dinosaurs, with the exception of birds, went extinct
7.5.1: The event was likely caused by an asteroid, but may have been caused by climate change
7.5.2: Another theory is that dinosaurs often refused to eat angiosperms, a type of plant that evolved around 100 million years ago, which became more common
8: Modern Life
8.1: Mammals and birds dominated the world after the extinction event
8.2: Despite continued climate fluctuations and extinction events, species continued to evolve into what we know today, including humans
8.3: Ecology provides us with the best guesses of what will happen
too lazy to study so i'll watch this in bed
This is soooo Gnarly
I love it
Hello sir
How can i Buy this full video lessons
This guy talk to fast
The Green brothers always make learning fun : )
can you please add a section on ENVIRONMENTAL HEALTH
whats his name again
In someway somehow, someone created us.. It's simple just say it
coucou seb
i watch his videos on x0.75
Where do I get this video script pdf?
This is how I'm passing my highschool biology class.
I have to memorize all these time periods and what happened in each… Pray for me please…
Oh, and spelling counts ;;-;;
Its funny how he says he doesn't know and continues to make assumptions, I call this opinion and not facts .
And therefore I'm okay with knowing your view .
Your so knowledgeable at such a young age and I love your enthusiasm. Keep teaching brother 👍
Dose carmax still take any car
PBS Eons