"The Origin of Life on Earth" Evolution of Biology PPT Courseware 2

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 2

Collect:0 Like:0

Collect 0 Like 0

Authoritative    PPT Summary

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 2

Was there life on the earth in the first place? What was the earliest life that appeared?...

We cannot observe it ourselves, and it is difficult to obtain direct evidence... Therefore, we can make scientific speculations about the origin of life through relevant research.

Scientific speculation requires conclusive evidence, strict logic, and rich association and imagination.

1. Several hypotheses about the origin of life

1.Creationism

2. Spontaneous generation theory

3. Theory of chemical origin

4. Yu Sheng said

5. Hot spring ecosystem

Origin of Life

1. Characteristics of the 4.6 billion-year-old primitive Earth:

It was blazing, with the red sun scorching in the sky, lightning and thunder, and volcanoes erupting on the ground, with lava overflowing. All elements are in a gaseous state and there is no life...

2. The primitive earth provided:

(1) Place: primitive atmosphere and primitive ocean

(2) Substances: methane (CH4), ammonia (NH3), water (H2O), hydrogen (H2), hydrogen sulfide (H2S), hydrogen cyanide (HCN), etc.

(3) Energy: cosmic rays, ultraviolet rays, lightning, energy released by volcanic eruptions, etc.

When did the origin of life occur?

Astronomers estimate that the Earth formed about 4.6 billion years ago.

The earliest fossils found so far record prokaryotes from 3.5 billion years ago.

The origin of life occurred approximately 4.5-3.5 billion years ago.

discuss

1. What is the difference between the composition of the earth's original atmosphere and the composition of the current atmosphere?

The original atmospheric composition had no oxygen. The current atmosphere consists of O2.

2. Was there life on the primitive earth? Give reasons.

does not exist. Because there is no environment in which life can exist.

3. Based on the results of Miller's experiment, speculation on the origin of life:

The primitive earth can produce organic matter that constitutes living organisms. Therefore, the stage of the origin of life from inorganic matter to organic matter is complete and achievable.

4. Meteorites contain organic matter needed to form living organisms. It can be inferred that:

The organic matter that makes up living organisms can be formed from outside the Earth and brought to Earth.

practise

1. Do you think that under the current environmental conditions, primitive life will no longer be formed on the earth? Why?

No more primitive life will form. Because there are no environmental conditions required for the formation of primitive life, such as primitive atmosphere, high temperature, continuous thunder and lightning, etc. In addition, the composition of the ocean is now changing.

2. Laozi, a famous thinker in ancient my country, said:

"Everything in the world is born from existence, and existence is born from nothingness." Does this coincide with the views on the origin of life in modern biology, or is it completely different? Give your opinion.

Keywords: Evolution of Biological Teaching Courseware, Origin of Life on Earth Teaching Courseware, New People's Education Edition Biology PPT Courseware for 8th Grade Volume 2, 8th Grade Biology Slide Courseware Download, Evolution of Biological PPT Courseware Download, Origin of Life on Earth PPT Courseware download, .ppt format

For more information about the PPT courseware "Evolution of Biology and the Origin of Life on Earth", please click the Evolution of Biology ppt and the Origin of Life on Earth ppt tag.

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 6:

"The Origin of Life on Earth" PPT courseware on the evolution of living things 6 Please think about how long it took for the earth to come into existence? Was there life after the creation of the earth? Approximately how long ago did humans come into being? How did it come about? What were the earliest organisms on earth like?

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 5:

"The Origin of Life on Earth" Biological Evolution PPT Courseware 5 Exploration Read several hypotheses about the origin of life and talk about which view you agree with more. View 1: Creationism This view holds that life was created by God or gods. Viewpoint 2: It happens naturally..

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 4:

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 4 The earth was born 4.6 billion years ago. Was there life on the earth at first? What were the earliest creatures? 1. Several hypotheses about the origin of life 1. Creationism 2. Spontaneity 3. Cosmonogenesis 4. Chemical evolution..

︶ ̄Ss°╮

Works 91564 Articles 5168
Upgrade VIP Free Download
Download Points: 0.00

Daoge Coin

Note: 1 Daoge Coin = 1 RMB = 10 points

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 2 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!

文件名 如何下载使用 下载次数 Download Points 下载地址
"The Origin of Life on E... 18225次 0.00 Free Download

Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "The Origin of Life on Earth" Evolution of Biology PPT Courseware 2 is enough.

How to use the Windows system template

Directly decompress the file and use it with office or wps

How to use the Mac system template

Directly decompress the file and use it Office or wps can be used

Related reading

For more detailed PPT-related tutorials and font tutorials, you can view: Click to see

How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box

Notice

Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 2, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.

(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)

Preview

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 2

Related reading

For more detailed PPT-related tutorials and font tutorials, you can view:Please click to see

Read article >

Collect 0
Like 0
Related popular resources
Read related articles