The document discusses the origins of life on Earth. It describes the early conditions on the primitive Earth that allowed for life to emerge, including the presence of liquid water, moderate temperatures, sunlight, and gases like carbon dioxide and methane in the atmosphere from volcanoes. Early life forms like bacteria emerged around 3.8 billion years ago. The document then discusses theories for how life began like spontaneous generation, the Miller-Urey experiment that produced amino acids from conditions simulating early Earth, and chemical evolution in underwater vents. Early life was in the form of prokaryotes for over a billion years before oxygen accumulated in the atmosphere around 2 billion years ago due to photosynthesis by cyanobacteria, allowing for more complex aerobic life
This Powerpoint Presentation (PPT) is all about Oxygen Revolution and How oxygen exists at the start of the Early Earth.
For BS Marine Transportation and BS Marine Engineering
The Viking labelled release experiment: life on Mars?Neil Saunders
This is a very old talk from around 1999 that I gave to my department at the Free University of Amsterdam. It\'s very out of date now, but still interesting.
The universe began about 14.4 billion years ago.
The Big Bang Theory states that, in the beginning, the universe was all in one place.
To know more, see the presentation.
The full Crash Course Ecology Series- now in Note-Form! I've added my own little 'twists' on the notes, and have added some pictures to make studying easier.
This Powerpoint Presentation (PPT) is all about Oxygen Revolution and How oxygen exists at the start of the Early Earth.
For BS Marine Transportation and BS Marine Engineering
The Viking labelled release experiment: life on Mars?Neil Saunders
This is a very old talk from around 1999 that I gave to my department at the Free University of Amsterdam. It\'s very out of date now, but still interesting.
The universe began about 14.4 billion years ago.
The Big Bang Theory states that, in the beginning, the universe was all in one place.
To know more, see the presentation.
The full Crash Course Ecology Series- now in Note-Form! I've added my own little 'twists' on the notes, and have added some pictures to make studying easier.
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this chapter prompts you to wonder where did life as we know it came from. this is a presentation from Dr.Tithi Parija (asst professor) from KIIT school of biotechnology including different theories from different thinkers and scientists
How life originated on earth is still a very tough question. We have found many evidences, we have a lots of hypothesis, but still we have miles to go. This PPT summarizes the findings of research on origin of life on earth.
Presentation is about the "Origin of Life". Many theories being proposed to clearly explains how does Life actually came into existence on our planet Earth.
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My fun and colorful grade 11 report on Life Sciences 2nd semester of A.Y. 2016-2017 under Ms. Lagmay
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Discover the innovative and creative projects that highlight my journey throu...dylandmeas
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As a business owner in Delaware, staying on top of your tax obligations is paramount, especially with the annual deadline for Delaware Franchise Tax looming on March 1. One such obligation is the annual Delaware Franchise Tax, which serves as a crucial requirement for maintaining your company’s legal standing within the state. While the prospect of handling tax matters may seem daunting, rest assured that the process can be straightforward with the right guidance. In this comprehensive guide, we’ll walk you through the steps of filing your Delaware Franchise Tax and provide insights to help you navigate the process effectively.
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Enterprise excellence and inclusive excellence are closely linked, and real-world challenges have shown that both are essential to the success of any organization. To achieve enterprise excellence, organizations must focus on improving their operations and processes while creating an inclusive environment that engages everyone. In this interactive session, the facilitator will highlight commonly established business practices and how they limit our ability to engage everyone every day. More importantly, though, participants will likely gain increased awareness of what we can do differently to maximize enterprise excellence through deliberate inclusion.
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A way to engage all in creating Inclusive Excellence. Lessons from the US military and their parallels to the story of Harry Potter. How belt systems and CI teams can destroy inclusive practices. How leadership language invites people to the party. There are three things leaders can do to engage everyone every day: maximizing psychological safety to create environments where folks learn, contribute, and challenge the status quo.
Who might benefit? Anyone and everyone leading folks from the shop floor to top floor.
Dr. William Harvey is a seasoned Operations Leader with extensive experience in chemical processing, manufacturing, and operations management. At Michelman, he currently oversees multiple sites, leading teams in strategic planning and coaching/practicing continuous improvement. William is set to start his eighth year of teaching at the University of Cincinnati where he teaches marketing, finance, and management. William holds various certifications in change management, quality, leadership, operational excellence, team building, and DiSC, among others.
RMD24 | Retail media: hoe zet je dit in als je geen AH of Unilever bent? Heid...BBPMedia1
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Marvin neemt je in deze presentatie mee in de voordelen van non-endemic advertising op retail media netwerken. Hij brengt ook de uitdagingen in beeld die de markt op dit moment heeft op het gebied van retail media voor niet-leveranciers.
Retail media wordt gezien als het nieuwe advertising-medium en ook mediabureaus richten massaal retail media-afdelingen op. Merken die niet in de betreffende winkel liggen staan ook nog niet in de rij om op de retail media netwerken te adverteren. Marvin belicht de uitdagingen die er zijn om echt aansluiting te vinden op die markt van non-endemic advertising.
Attending a job Interview for B1 and B2 Englsih learnersErika906060
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3. Original Conditions on Primitive Earth
to make life….
• Presence of liquid water
• Moderate temperature range
• Free oxygen in the atmosphere
• Adequate sunlight
• Absence of toxic substances in atmosphere
• Absence of lethal radiation
4. Volcanoes Play a BIG Role
• Water vapor (eventually condensed and fell as RAIN)
• Methane
• Hydrogen
• Nitrogen
• Ammonia
• Carbon Dioxide (we now have oxygen b/c of photosynthetic
bacteria)
• Carbon Monoxide
5. Earth History
• Evolution is studied using concepts about earth history. The
earth is between 4.3 and 4.5 billion years old.
• Approximately 3.9 billion years ago, the surface was likely
cool enough for water vapor to condense and form oceans
• Geological evidence suggests that cells similar to modern
bacteria were common 3.8 billion years ago.
6. How did life on Earth begin?
Until the 1700’s people believed that living things
could come from nonliving substances, spontaneous
generation.
7. Spontaneous generation: Pasteur’s experiment
• Experiment: Pasteur filled a flask with broth with a long S shaped neck.
He boiled it to kill all life. It was open and exposed to air, but anything in
the air got stuck on the curves of the neck.
• Conclusion: Spontaneous generation was disproved and biogenesis
theory was substantiated. Contamination came from other
microorganisms, not “air”.
QUESTIONS
• What was the hypothesis? What was the experimental group? The
control group? The constants? The variable?
8. Theory of Chemical Evolution
“Primordial Soup Theory”
• Conditions on the early Earth were
very different.
• The atmosphere had no oxygen
• Energy sources, such as lightning, volcanic activity, and ultraviolet
sunlight (no ozone layer)
9. Chemical Evolution
• Earth’s early atmosphere: HCN, CO2, CO, N, H, S, H2O
• “Life arose from the oceans”
• He believed that energy from lightning and the sun can
spark chemical reactions to create AMINO ACIDS that made
proteins.
10. Chemical Evolution
Urey and Miller
• created in the
laboratory, the
conditions of early
Earth.
• They discharged
sparks in an
“atmosphere” of
the Miller-Urey
model consisted of
H2O, H2, CH4, and
NH3 gases.
• produced a variety
of amino acids and
other organic
molecules.
11. Chemical Evolution
• Alternate sites proposed for the synthesis of organic
molecules include
• submerged volcanoes and deep-sea vents where
hot water and minerals gush into the deep ocean.
12. Prokaryotes
• Prokaryotes were the earliest organisms on
Earth and evolved alone for 1.5 billion years.
• two prokaryotic domains:
Bacteria and Archaea
13. Prokaryotes
• have a cell wall external
to the cell membrane
• Lack membrane bound
nuclues and organelles
• Double-stranded DNA
molecule is in a single
ring shaped
14. OXYGEN ATMOSPHERE The evidence of oxygen gas
formation can be seen in rocks
• Remember the atmosphere of early when layers of iron oxide on the
Earth was made up of nitrogen, bottoms of oceans stopped
carbon dioxide, water vapor, but no forming when oxygen appeared.
free oxygen
• Oxygen comes from photosynthesis
when leaving oxygen gas.
• About 2 billion years ago, the oxygen
level in the atmosphere started to
rise. Cyanobacteria created the
oxygen in the atmosphere.
• Aerobic metabolism, much more
efficient than anaerobic, became
possible. Question
What are the reactants in
photosynthesis?
The products?
Editor's Notes
Experimental group: Exposed for 1 year, no microorganismsControl Groups : Removed “S” curve and exposed it for 1 day and microorganisms grewConclusion: Spontaneous generation was disproved and biogenesis theory was substantiated. Contamination came from other microorganisms, not “air”.