"The Process of Biological Evolution" Biological Evolution PPT Courseware 3

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"The Process of Biological Evolution" Biological Evolution PPT Courseware 3

There are many kinds of creatures on the earth. How did life on the earth come from?

The theory of chemical origins points out that life on earth can gradually evolve from non-living substances into primitive life through a long chemical pathway.

So, how did primitive life evolve into all kinds of biological world?

No one can personally experience such an evolutionary process, but scientists can reveal the mysteries of biological evolution through different and effective methods.

Methods for studying biological evolution-----comparative method

Comparison method - Compare the characteristics of things that are related to each other based on certain standards to grasp the inner connections between things and understand the essence of things.

By comparing fossils from different strata, what assumptions can you make about the evolution of organisms?

In strata formed earlier, the fossils are simpler and lower, etc.

In strata formed later, the fossils are more complex and advanced, etc.

The order of biological evolution:

Organisms progress from simple to complex,

Life forms from aquatic to terrestrial,

Creatures progress from low to high.

skill training

Please read pages 56-57 and answer the questions after class.

The evidence supporting hypothesis A includes: 1, 2, and 3, among which evidence 1 has the strongest support.

The evidence supporting hypothesis B is: 4, 5, 6, and 7, among which evidence 5 has the strongest support.

1. Multiple choice questions

1. Among the methods for studying biological evolution, the most important one is ( )

A. Compare B． Imagine C. Guess D. fantasy

2. Which of the following statements about comparison methods is incorrect ( )

A comparison refers to comparing things that are related to each other according to certain standards.

B． By comparing the characteristics of various things, we can grasp the internal connections between things and understand the essence of things.

C. Compare the morphological structures of different biological species to infer the genetic relationship between them

D. Comparison can determine the similarities and differences of anything

3. Scientists have discovered that there are differences in the cytochrome C of some organisms: the difference between humans and chimpanzees is minimal, the difference between humans and horses is greater, and the differences between fruit flies and sunflowers are even greater. This shows that the closest relationship to humans is ( )

A. Horse B. Drosophila C. Sunflower D. chimpanzee

4. According to the similarities between the body structure of Archaeopteryx and reptiles and birds, the following conclusions can be drawn through logical reasoning ( )

A. Reptiles evolve into birds

B． Birds evolve into reptiles

C. Reptiles are related to birds

D. Life originated from inorganic matter

Homework:

1. Some fossils have not been discovered by humans; some organisms have left no fossils; changes in the earth's crust or environment have led to the destruction of some fossils, etc.

2. We cannot simply answer whether the chicken or the egg came first, because any living thing is constantly evolving and developing. The process of evolution is long, and heredity and variation are the basis of evolution. In the process of evolution from reptiles to birds, mutations continued to occur, and this mutation was preserved and inherited through natural selection. From an evolutionary perspective, when the chicken species was formed, chickens and eggs were formed at the same time. From a genetic level, chickens and eggs have the same genetic material basis, and the two appear on the earth in no particular order.

3. These very simple and low-level creatures have not become extinct because they can adapt to the changing environment, and they are still widely distributed.

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For more information about the PPT courseware "Evolution of Biology and the Process of Biological Evolution", please click on the Evolution of Biology ppt Process of Biological Evolution ppt tag.

"The Process of Biological Evolution" PPT:

"The Process of Biological Evolution" PPT Part One Content: Situation Introduction Information: At the beginning of the birth of life, there were only the simplest single-celled organisms on the earth. Today's earth is full of rich and colorful creatures. So where did today's living things come from? until..

"The Process of Biological Evolution" Biological Evolution PPT Courseware 5:

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Update Time: 2024-11-18

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 2 industry PPT template

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