Living Earth
Freshman / 9th grade
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Summary
Living Earth Unit 5 Test Review Freshman
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---27March 20252024/2025
- Unit 5 Test Notes Summary for Mr.Hwang's Living Earth Class 
Contains notes from: 
 
Types of Plants 
 
Plant Structure and Function 
 
Photosynthesis 
 
Toxic Plants
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Class notes
Freshman Living Earth Unit 5 Toxic Plants Notes
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---7March 20252024/2025
- Poison Ivy 
Grows in much of the eastern United States. 
Depending on the species, can be a "shrub" or a "vine," the latter requiring a tree for support. 
In about 75%-85% of the population, it generates contact dermatitis, or inflammation of the skin. 
Inflammation caused by urushiol oil on the plant. 
This oil sticks to nearly anything: skin, clothing, equipment, etc. 
Poison Oak 
Grows in much of the western United States, especially in California. 
Like Poison Ivy, inflammation i...
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Class notes
Freshman Living Earth Unit 5 Photosynthesis Notes
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---6March 20252024/2025
- Photosynthesis 
• Carried out by autotrophs, this is the principal means by which energy enters the food chain. 
Photosynthesis 
• The chemical equation for photosynthesis is below. 
• Photosynthesis uses the energy from sunlight to convert water and carbon dioxide into sugar and oxygen. 
• Chloroplasts are the organelles in which photosynthesis takes place. 
• Within the chloroplasts are chlorophyll A and chlorophyll B, pigment molecules that help absorb light...
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Class notes
9th Grade Living Earth Metric System Notes
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---3October 20242024/2025
- Metric System Notes 
1. Metric vs. the United States 
a.The metric system is the standard unit of measurement used by industrialized nations 
b....except by the United States 
C. Whereas most of the world uses the “meter”, we use the “foot” 
d. Likewise we use “miles” instead of "kilometers”
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Class notes
9th Grade Living Earth Population Notes
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---5October 20242024/2025
- 6. Population Growth 
Measure the size of a population, which can be affected by three factors. 
 I. The number of births 
II. The number of deaths 
 III. The number of individuals that enter or leave the population 
 
Remember, population doesn't count the number of individuals within an entire species, just the number in a given area! 
 
b. Populations simply grow when the birth rate exceeds the death rate 
 
c. If the death rate is greater than the birthrate, the population shrinks ...
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