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Grades 4–5
The Nitrogen Cycle
science · RI.4.4
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Grades 5–8
Nitrogen Cycle
life science · MS-LS2-3
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Grades 5–8
How Many Valence Electrons Does Oxygen Have?
physical science · MS-PS1-2
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Grades 5–8
What Gases Make Up Air
weather and climate · MS-ESS2-5
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Grades 3–8
What is the Relationship between the Oxygen Cycle and the Carbon Cycle?
life science
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Grades 5–8
What Is Air Made Of
weather and climate · NGSS MS-ESS2-5
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Grades 6–8
How Humans Disrupt Earth's Cycles
earth science · MS-ESS2-1
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Grades 5–8
What Was the Oxygen Revolution
earth science · MS-ESS1-4
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Passage
Grade 6
Anaerobic Respiration
life science
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Passage
Grade 6
What Is The Most Abundant Gas In The Atmosphere?
earth science
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Passage
Grades 5–8
Photosynthesis
life science · MS-LS1-6
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Passage
Grades 5–8
How Cells Release Energy Without Oxygen
life science · MS-LS1-7
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Passage
Grades 5–8
Nonmetals on Periodic Table
physical science · MS-PS1-1
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Grades 6–8
How Matter Cycles Through Earth Systems
earth science · MS-ESS2-1
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Passage
Grade 6
Aerobic Organisms
life science
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Passage
Grade 6
Aerobic Respiration
life science
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Passage
Grade 6
Uses Of Algae
life science
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Passage
Grades 3–5
How Heart and Lungs Work Together
life science · NGSS 4-LS1-1
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Passage
Grades 3–8
What are the products of Photosynthesis?
life science
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Passage
Grades 3–5
How the Lungs Work
life science · NGSS 4-LS1-1
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Grades 3–5
How Animal Lungs Work
life science · NGSS 4-LS1-1
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Passage
Grade 6
Conditions for Germination
life science
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Passage
Grade 6
Effects of High Altitude on the Human Body
science
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Passage
Grades 5–8
Photosynthesis in Ecosystems
life science · MS-LS1-6
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Passage
Grades 3–8
How Many Hearts Does an Octopus Have?
science
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Passage
Grades 3–5
How We Breathe
life science · NGSS 4-LS1-1
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Grades 5–8
Vampire Squid Adaptations
science · MS-LS4-4
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Grades 5–8
Noble Gases
physical science · MS-PS1-1
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Passage
Grades 4–6
How Forests Affect Air
science · 5-ESS2-1
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Passage
Grades 3–5
How Animal Hearts Work
life science · NGSS 4-LS1-1
Free
Passage
Grades 4–6
Rusting Is Chemical Change
physical science · 5-PS1-4
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Passage
Grades 3–5
What Does Blood Do
life science · NGSS 4-LS1-1
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Passage
Grade 6
How Ancient Archaea Shape Our Planet
life science
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Passage
Grades 3–8
What causes Acid rain?
physical science
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Grades 3–5
Lungs vs Gills
life science · NGSS 4-LS1-1
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Passage
Grades 6–8
How Smog and Acid Rain Affect Life
earth science · MS-ESS3-3
$1.50
Passage
Grades 5–8
Climate Threats to Freshwater Ecosystem
weather and climate · MS-LS2-4
$1.50
Passage
Grade 6
Anaerobic Respiration in Yeast
life science
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Passage
Grades 2–4
How can planting trees help fight climate change?
weather and climate · RI.3.1
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Passage
Grades 5–8
The Gaia Hypothesis
science
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Passage
Grades 3–6
How Fish Breathe
life science
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Passage
Grades 3–5
How Heart Pumps Blood
life science · NGSS 4-LS1-1
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Passage
Grades 5–8
Photosynthesis and Respiration Connection
life science · MS-LS1-6
$1.50
Passage
Grades 3–5
How Fish Gills Work
life science · NGSS 4-LS1-1
$1.50
Passage
Grades 5–8
Respiratory System
life science · MS-LS1-3
Free
Passage
Grades 5–8
Groups with Metalloids
physical science · MS-PS1-1
$1.50
Passage
Grades 3–5
How Burning Fuel Produces Energy
physical science · NGSS 4-PS3-4
$1.50
Passage
Grades 3–8
What are the reactants of Photosynthesis
life science
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Passage
Grades 5–8
What Are Silicate Minerals
earth science · MS-ESS2-1
$1.50
Passage
Grades 5–8
Water Quality
science · MS-ESS3-1
$1.50
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