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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
Collection5 items
01Biology · L2 · What Are Hormones?
02Biology · L2 · Key Glands and Their Jobs
03Biology · L2 · Hormones and Glands Quiz
+2 moreBiology · L2 · Hormones and Glands
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Biology · L2 · Hormones and GlandsCollection5 items
01Biology · L2 · Puberty and Growing Up
02Biology · L2 · The Reproductive System's Basic Job
03Biology · L2 · Growing Up and Reproduction Basics Quiz
+2 moreBiology · L2 · Growing Up and Reproduction Basics
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Biology · L2 · Growing Up and Reproduction BasicsCollection5 items
01Biology · L2 · Chlorophyll and the Hidden Pigments
02Biology · L2 · Why Leaves Change Color in Autumn
03Biology · L2 · Leaf Pigments and Color Change Quiz
+2 moreBiology · L2 · Leaf Pigments and Color
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Biology · L2 · Leaf Pigments and ColorCollection5 items
01Biology · L2 · Sound and Movement Signals in Animals
02Biology · L2 · Body Language and Visual Signals in Animals
03Biology · L2 · How Animals Communicate Quiz
+2 moreBiology · L2 · Animal Communication
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Biology · L2 · Animal CommunicationCollection5 items
01Biology · L2 · The Six Nutrient Groups
02Biology · L2 · Building a Balanced Meal
03Biology · L2 · Food Groups and Nutrition Quiz
+2 moreBiology · L2 · Food Groups and Nutrition
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Biology · L2 · Food Groups and NutritionCollection5 items
01Biology · L2 · Types of Joints: The Basics
02Biology · L2 · Joints in Everyday Movement
03Biology · L2 · Types of Joints Quiz
+2 moreBiology · L2 · Types of Joints
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Biology · L2 · Types of JointsCollection5 items
01Biology · L2 · How a Microscope Magnifies the Tiny World
02Biology · L2 · The Discovery of Cells and Cell Theory
03Biology · L2 · Timeline: From Hooke's Cork to Cell Theory
+2 moreBiology · L2 · Discovering Cells
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Biology · L2 · Discovering CellsCollection5 items
01Biology · L2 · What Is Herd Immunity?
02Biology · L2 · Vaccination Rates and Outbreak Risk
03Biology · L2 · Herd Immunity Quiz
+2 moreBiology · L2 · Herd Immunity
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Biology · L2 · Herd ImmunityCollection5 items
01Biology · L2 · The Transpiration Process
02Biology · L2 · Wilting and Water Balance
03Biology · L2 · Transpiration Quiz
+2 moreBiology · L2 · Transpiration
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Biology · L2 · TranspirationCollection5 items
01Biology · L2 · Major Invertebrate Groups
02Biology · L2 · Comparing Invertebrate Features
03Biology · L2 · Invertebrate Diversity Quiz
+2 moreBiology · L2 · Invertebrate Diversity
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Biology · L2 · Invertebrate DiversityCollection5 items
01Biology · L2 · What Is DNA? The Basics
02Biology · L2 · DNA, Genes, and Chromosomes
03Biology · L2 · What Is DNA? Quiz
+2 moreBiology · L2 · What Is DNA?
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Biology · L2 · What Is DNA?Collection5 items
01Biology · L2 · Why Food Spoils and How We Slow It Down
02Biology · L2 · Four Ways to Preserve Food
03Biology · L2 · Food Preservation Quiz
+2 moreBiology · L2 · Food Preservation
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Biology · L2 · Food PreservationCollection5 items
01Biology · L2 · How Long Do Animals Live?
02Biology · L2 · Why Do Lifespans Vary So Much?
03Biology · L2 · Animal Lifespans Quiz
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Biology · L2 · Animal LifespansCollection5 items
01Biology · L2 · Cellular Respiration: The Word Equation
02Biology · L2 · Respiration vs. Photosynthesis
03Biology · L2 · Cellular Respiration Quiz
+2 moreBiology · L2 · Cellular Respiration Basics
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Biology · L2 · Cellular Respiration BasicsCollection5 items
01Biology · L2 · Thick Stems and Leaves That Store Water
02Biology · L2 · Roots and Waxy Coatings in Desert Plants
03Biology · L2 · How Desert Plants Store Water Quiz
+2 moreBiology · L2 · Desert Water-Storing Plants
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Biology · L2 · Desert Water-Storing PlantsCollection5 items
01Biology · L2 · Punnett Square Vocabulary: Allele, Dominant, and Recessive
02Biology · L2 · Crossing Pp × Pp: Building One Punnett Square
03Biology · L2 · A Gentle Introduction to Punnett Squares Quiz
+2 moreBiology · L2 · Punnett Square Intro
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Biology · L2 · Punnett Square IntroCollection5 items
01Biology · L2 · How Breathing and Circulation Connect
02Biology · L2 · Exercise and the Oxygen Delivery Chain
03Biology · L2 · Body Systems Working Together Quiz
+2 moreBiology · L2 · Body Systems Working Together
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Biology · L2 · Body Systems Working TogetherCollection5 items
01Biology · L2 · Complete vs. Incomplete Metamorphosis: The Basics
02Biology · L2 · Metamorphosis in Action: Insect Examples
03Biology · L2 · Complete vs. Incomplete Metamorphosis Quiz
+2 moreBiology · L2 · Complete and Incomplete Metamorphosis
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Biology · L2 · Complete and Incomplete MetamorphosisCollection5 items
01Biology · L2 · The Three Basic Bacteria Shapes
02Biology · L2 · Example Bacteria for Each Shape
03Biology · L2 · Bacteria Shapes Quiz
+2 moreBiology · L2 · Bacteria Shapes
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Biology · L2 · Bacteria ShapesCollection5 items
01Biology · L2 · What Is Asexual Plant Propagation?
02Biology · L2 · Runners, Tubers, and Cuttings in Action
03Biology · L2 · Plant Propagation Without Seeds Quiz
+2 moreBiology · L2 · Plant Propagation Without Seeds
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Biology · L2 · Plant Propagation Without SeedsCollection5 items
01Biology · L2 · Why Cells Divide
02Biology · L2 · The Simple Steps of Cell Division (Mitosis)
03Biology · L2 · The Cell Cycle: Why and How Cells Divide Quiz
+2 moreBiology · L2 · The Cell Cycle: Why and How Cells Divide
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Biology · L2 · The Cell Cycle: Why and How Cells DivideCollection5 items
01Biology · L2 · What Is Melanin?
02Biology · L2 · Melanin: Sun Protection and Inheritance
03Biology · L2 · Skin Color and Melanin Quiz
+2 moreBiology · L2 · Skin Color and Melanin
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Biology · L2 · Skin Color and MelaninCollection5 items
01Biology · L2 · The Three Main Types of Vaccines
02Biology · L2 · Comparing How Vaccines Are Made
03Biology · L2 · Vaccine Types Quiz
+2 moreBiology · L2 · How Vaccines Are Made
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Biology · L2 · How Vaccines Are MadeCollection5 items
01Biology · L2 · Camels: Fat Storage and Fast Rehydration
02Biology · L2 · Kangaroo Rats and Nighttime Survival
03Biology · L2 · How Desert Animals Conserve Water Quiz
+2 moreBiology · L2 · Desert Animal Water Conservation
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Biology · L2 · Desert Animal Water ConservationCollection5 items
01Biology · L2 · Antibodies: The Lock-and-Key Idea
02Biology · L2 · How Antibodies Mark Invaders for Destruction
03Biology · L2 · Antibodies and the Lock-and-Key Idea Quiz
+2 moreBiology · L2 · How Antibodies Recognize Invaders
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Biology · L2 · How Antibodies Recognize InvadersCollection5 items
01Biology · L2 · Meet the Plants That Fight Back
02Biology · L2 · Spotting Plant Defenses in the Wild
03Biology · L2 · Simple Plant Defenses Quiz
+2 moreBiology · L2 · Simple Plant Defenses
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Biology · L2 · Simple Plant DefensesCollection5 items
01Biology · L2 · Meet the Neuron
02Biology · L2 · Crossing the Synapse
03Biology · L2 · How Nerve Cells Send Messages Quiz
+2 moreBiology · L2 · How Nerve Cells Send Messages
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Biology · L2 · How Nerve Cells Send MessagesCollection6 items
01Biology · L2 · Discovering a New Species
02Biology · L2 · The Two-Part Scientific Name
03Biology · L2 · Practice: Match the Species Name
+3 moreBiology · L2 · How Scientists Name a New Species
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Biology · L2 · How Scientists Name a New SpeciesCollection7 items
01Biology · L3 · Glucose
02Biology · L3 · Glycine (amino acid)
03Biology · L3 · Adenine (DNA base)
+4 moreBiology · L3 · Molecules of Life
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Biology · L3 · Molecules of LifeCollection10 items
01Biology · L3 · Logistic Population Growth
02Biology · L3 · Enzyme Kinetics (Michaelis–Menten)
03Biology · L3 · Exponential Decay (Drug Clearance)
+7 moreBiology · L3 · Quantitative Biology: Plots and More Molecules
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Biology · L3 · Quantitative Biology: Plots and More Molecules