Early Evolution

Evolution

the changing of plants, animals, and other living organisms on Earth over time.

Example:

Wolves to Different Dog Breeding

​man walking with 4 limbs to modern standing-straight man

Early Earth

4.6 billion years ago

Earth has NO OXYGEN at all!

therefore, NO life

Multiple Select

Which conditions necessary for life?

• presence of liquid water

• oxygen in the atmosphere

• electricity and buildings

• sunlight and moderate temperature

Multiple Choice

The early Earth's atmosphere lacks oxygen. True or False?

• True

• False

• maybe

Yes, the first life on earth is bacteria

-bacteria can live with or without oxygen(anaerobic)

-evolved into a photosynthetic one

-become anaerobic photosynthetic bacteria

Multiple Choice

Anaerobic bacteria means a bacteria that

• can live without the presence of oxygen

• cannot live without the presence of oxygen

• can live longer in the presence of oxygen

Cyanobacteria

• How did life arise on Earth?

• cyanobacteria- prokaryotes that are photosynthetic

• first(primitive) organisms- anaerobic prokaryotes

• the anaerobic photosynthetic bacteria(cyanobacteria) started producing oxygen to the earth's atmosphere

Multiple Choice

Which process bring oxygen into the atmosphere?

• protein synthesis

• photosynthesis

• cellular respiration

Multiple Choice

Which is the best description of the organisms that brought oxygen to the early Earth's atmosphere?

• bacteria

• microorganism

• photosynthetic bacteria

• anaerobic photosynthetic bacteria

Multiple Choice

Put it in the correct order based on what organisms first appear on the surface of the EArth.

I photosynthetic prokaryotes

II unicellular eukaryotes

III anaerobic prokaryotes

IV multicellular eukaryotes

• I, II, III, IV

• II, I, IV, III

• III, I, II, IV

• IV, II, I, III

suggested the young Earth could have life through the presence of basic organic molecules(amino acids)

-that amino acids could develop from inorganic such as methane, water, carbon, sulfur, etc

​Miller-Urey's Experiment

Evolution of Cells

1. unicellular prokaryotes
2. photosynthetic prokaryotes
3. unicellular eukaryotes
4. multicellular eukaryotes
5. very small plants and animals

Multiple Choice

According to Miller-Urey's experiment, what basic molecules that developed in the early atmosphere that started life on a young Earth?

• Sun

• water

• salts

• amino acids

Multiple Choice

Miller-Urey experiment produced 21 amino acids. What is the significance of the presence of amino acids on a young Earth?

• Amino acids brought oxygen to the early atmosphere that started life on a young Earth

• Amino acids created the eukaryotic cells that brought oxygen to the early Earth's atmosphere.

• Amino acids are the make up proteins, which are the structural components of all living things.

Multiple Choice

The organisms that can live without oxygen are called

• mutant

• aerobic(or aerobes)

• anaerobic (or anaerobes)

• extraordinary

Reorder

Reorder the following: the beginning of life on Earth

• unicellular prokaryotes

• unicellular eukaryotes

• algae

• smaller plants and animals

1

2

3

4

• 1
• 2
• 3
• 4

Multiple Choice

The earliest organisms that live when Earth has NO oxygen

• virus

• prokaryotes

• eukaryotes

• multicellular organisms

Multiple Choice

The changing of species over time

• mutation

• evolution

• extinction

• natural selection

Extinction of Species

How many species is now extinct?

99%

What is extinct means?

stop existing

-fossil record
-biographical(species distribution)
-anatomical comparison (homologous/analogous bone structures)

​-embryology
-biochemistry(DNA comparison)

​What are the evidences of evolution?

Create a Cause-and-Effect Model
Summarize the evidence of evolution, using these slides.