Life Science 7th

What is Life?

Welcome to:

LIfe Science

ÍNDex

01. The Scientific Method

03. Characteristic of living things

02. Origin of life

06. History of life on earth

04. The Cell Theory

05. Organelles

07. classification of living things

08. Archea, bacteria and viruses

The Scientific MEthod

Stating the Problem

Is a concise description of an issue to be addressed or a condition to be improved upon

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Gathering Information on the problem

The first step in solving a scientific problem is to find out or review everything important related to it.

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Forming a Hypothesis

A suggested solution is called Hypothesis. It is almost always formed after the information related to the problem has been carefully studied. Sometimes a hypothesis is the result of creative thinking.

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Performing Experiments to test the hypothesis

To test the hypothesis by performing certain activities. These activities are called experiments. The results of the experiment must make sure that the results of the experiment clearly support or do not support the hypothesis.

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REcording and Analyzing Data

Data include observations such as measurements. Then scientists analyzed the recorded data.

Stating a conclusion

After analyzing the recorded data, the scientists came to a conclusion.

Repeating the work

It is necessary to repeat many times the test to have a vaild conclusion. To make sure the data were accurate. .

Origin of life

Origin of Life

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Characteristics of living things

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Cell Theory

Cell Wall

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cell membrane

nucleus

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Organelles

ribosomes

Mithocondria

chloroplast

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Lysosomes

endoplasmic reticulum

Golgi aparatus

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Cytoskeleton

Vacoule

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The history of life on earth

how do we learn about ancient life

Paleontologists look for clues to understand what happened in the past. These scientists use fossil to reconstruct the history of life. A fossil: is a trace of imprint of a living thing that is preserved by geological processes.

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Vocabulary

What is the geologic time scale?

After a fossil is dated, a paleontologist can place the fossil in chronological order with other fossils. This ordering allows scientists to hypothesize about relationship between species and how organisms changed over time.

eons

Phanerozoic eon

Hadean eon

Archean eon

Proterozoic eon

3850 Ma-2500 Ma

542 Ma- today

2500 Ma-542Ma

4600 Ma-3850 Ma

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Phanerozoic eon

eras

paleozoic Era

Cenozoic era

Mesozoic era

542 Ma - 251 Ma

65.5 Ma- Today

251 Ma - 65.5 Ma

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Vocabulary

Classification of Living things

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How do scientists know living things are related?

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Physical characteristic

Chemical characteristic

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What's in a name?

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Carolus linnaeus

cLADOGRAM

BUILDING A cLADOGRAM

nEW cLASSIFICATION

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Vocabulary

Domains

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eukarya

archaea

bacteria

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The five kingdoms

As a result of discoveries of new life forms and changing ideas about those characteristics of greatest importance in classifying organisms, the most generally accepted classification system now contains five kingdoms

Monera

Protista

plantae

fungi

animalia

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archea, bacteria &viruses

Prokaryote vrs Eukaryotes

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Vocabulary

BActeria/ARchea

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Viruses

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Viruses

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