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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
Collection5 items
01Biology · L3 · Organelle Structure and Function
02Biology · L3 · Membrane Transport and the Cell Cycle
03Biology · L3 · Cell Biology Quiz
+2 moreBiology · L3 · Cell Biology
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Biology · L3 · Cell BiologyCollection4 items
01Biology · L3 · Mendelian Genetics Vocabulary
02Biology · L3 · Punnett Squares and Inheritance Patterns
03Biology · L3 · Genetics and Heredity: Reading a Punnett Square
+1 moreBiology · L3 · Genetics and Heredity
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Biology · L3 · Genetics and HeredityCollection5 items
01Biology · L3 · DNA Structure
02Biology · L3 · DNA Replication
03Biology · L3 · DNA Structure and Replication Quiz
+2 moreBiology · L3 · DNA Structure and Replication
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Biology · L3 · DNA Structure and ReplicationCollection5 items
01Biology · L3 · Mechanisms of Evolution
02Biology · L3 · Evidence for Evolution and Speciation
03Biology · L3 · Evolution and Natural Selection Quiz
+2 moreBiology · L3 · Evolution and Natural Selection
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Biology · L3 · Evolution and Natural SelectionCollection5 items
01Biology · L3 · Heart Anatomy and the Cardiac Cycle
02Biology · L3 · Blood Vessels and Blood Composition
03Biology · L3 · Double Circulation
+2 moreBiology · L3 · The Circulatory System
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Biology · L3 · The Circulatory SystemCollection5 items
01Biology · L3 · Respiratory Anatomy
02Biology · L3 · Breathing Mechanics and Gas Exchange
03Biology · L3 · The Respiratory System
+2 moreBiology · L3 · The Respiratory System
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Biology · L3 · The Respiratory SystemCollection5 items
01Biology · L3 · The Digestive System
02Biology · L3 · Path of Digestion
03Biology · L3 · Digestive Organs and Secretions
+2 moreBiology · L3 · The Digestive System
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Biology · L3 · The Digestive SystemCollection5 items
01Biology · L3 · Neuron Structure and the Action Potential
02Biology · L3 · CNS, PNS, and the Reflex Arc
03Biology · L3 · The Reflex Arc
+2 moreBiology · L3 · The Nervous System
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Biology · L3 · The Nervous SystemCollection5 items
01Biology · L3 · Innate Immunity
02Biology · L3 · Adaptive Immunity
03Biology · L3 · The Immune System Quiz
+2 moreBiology · L3 · The Immune System
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Biology · L3 · The Immune SystemCollection5 items
01Biology · L3 · Glands and Hormones
02Biology · L3 · Hormone Action and Feedback
03Biology · L3 · The Endocrine System Quiz
+2 moreBiology · L3 · The Endocrine System
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Biology · L3 · The Endocrine SystemCollection4 items
01Biology · L3 · Bone Structure and Types
02Biology · L3 · Joints and Skeletal Functions
03Biology · L3 · The Skeletal System Quiz
+1 moreBiology · L3 · The Skeletal System
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Biology · L3 · The Skeletal SystemCollection5 items
01Biology · L3 · The Three Types of Muscle Tissue
02Biology · L3 · How Skeletal Muscle Contracts
03Biology · L3 · Skeletal Muscle Contraction
+2 moreBiology · L3 · The Muscular System
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Biology · L3 · The Muscular SystemCollection5 items
01Biology · L3 · Kidney and Nephron Structure
02Biology · L3 · Urine Formation and Water Regulation
03Biology · L3 · The Excretory System
+2 moreBiology · L3 · The Excretory System
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Biology · L3 · The Excretory SystemCollection4 items
01Biology · L3 · Reproductive Anatomy
02Biology · L3 · Gametogenesis and Reproductive Hormones
03Biology · L3 · The Reproductive System
+1 moreBiology · L3 · The Reproductive System
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Biology · L3 · The Reproductive SystemCollection5 items
01Biology · L3 · Bacterial Structure and Classification
02Biology · L3 · Viruses and Infection
03Biology · L3 · Microbiology: Bacteria and Viruses
+2 moreBiology · L3 · Microbiology
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Biology · L3 · MicrobiologyCollection5 items
01Biology · L3 · Photosynthesis in Depth
02Biology · L3 · Plant Transport and Hormones
03Biology · L3 · Plant Biology
+2 moreBiology · L3 · Plant Biology
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Biology · L3 · Plant BiologyCollection5 items
01Biology · L3 · Population and Community Ecology
02Biology · L3 · Energy Flow and Nutrient Cycling
03Biology · L3 · Ecology and Ecosystems Quiz
+2 moreBiology · L3 · Ecology and Ecosystems
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Biology · L3 · Ecology and EcosystemsCollection5 items
01Biology · L3 · The Taxonomic Hierarchy and Binomial Nomenclature
02Biology · L3 · The Three Domains and Phylogenetic Trees
03Biology · L3 · Taxonomy and Classification Quiz
+2 moreBiology · L3 · Taxonomy and Classification
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Biology · L3 · Taxonomy and ClassificationCollection5 items
01Biology · L3 · The Four Macromolecules
02Biology · L3 · Enzymes and Enzyme Activity
03Biology · L3 · Biochemistry Quiz
+2 moreBiology · L3 · Biochemistry
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Biology · L3 · BiochemistryCollection5 items
01Biology · L3 · Cellular Respiration Stages
02Biology · L3 · Aerobic vs. Anaerobic Respiration and ATP Yield
03Biology · L3 · Cellular Respiration in Detail Quiz
+2 moreBiology · L3 · Cellular Respiration
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Biology · L3 · Cellular RespirationCollection5 items
01Biology · L3 · The Body's Thermostat
02Biology · L3 · Hot and Cold Responses Compared
03Biology · L3 · Homeostasis and Thermoregulation Quiz
+2 moreBiology · L3 · Thermoregulation
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Biology · L3 · ThermoregulationCollection5 items
01Biology · L3 · Macronutrients and Energy
02Biology · L3 · Metabolism, BMR, and BMI
03Biology · L3 · Human Nutrition Quiz
+2 moreBiology · L3 · Human Nutrition
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Biology · L3 · Human NutritionCollection5 items
01Biology · L3 · The ABO and Rh Blood Group Systems
02Biology · L3 · Transfusion Compatibility and Reactions
03Biology · L3 · Blood Types and Transfusion Quiz
+2 moreBiology · L3 · Blood Types and Transfusion
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Biology · L3 · Blood Types and TransfusionCollection5 items
01Biology · L3 · Skin Structure: The Three Layers
02Biology · L3 · Skin Functions, Hair, Nails, and Wound Healing
03Biology · L3 · The Integumentary System Quiz
+2 moreBiology · L3 · The Integumentary System
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Biology · L3 · The Integumentary SystemCollection5 items
01Biology · L3 · Lymphatic Vessels and Fluid Return
02Biology · L3 · Lymph Nodes, the Spleen, and Immune Defense
03Biology · L3 · How a Lymph Node Filters Pathogens
+2 moreBiology · L3 · The Lymphatic System
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Biology · L3 · The Lymphatic SystemCollection5 items
01Biology · L3 · Genetic Disorders Vocabulary
02Biology · L3 · Sickle Cell Anemia, Cystic Fibrosis, and Down Syndrome
03Biology · L3 · Genetic Disorders Quiz
+2 moreBiology · L3 · Genetic Disorders
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Biology · L3 · Genetic DisordersCollection5 items
01Biology · L3 · Physical and Chemical Plant Defenses
02Biology · L3 · Defensive Mutualism: The Ant-Acacia Relationship
03Biology · L3 · Plant Defenses and Adaptations Quiz
+2 moreBiology · L3 · Plant Defenses and Adaptations
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Biology · L3 · Plant Defenses and AdaptationsCollection5 items
01Biology · L3 · Innate Behavior and Fixed Action Patterns
02Biology · L3 · Learned Behavior: Habituation, Imprinting, and Conditioning
03Biology · L3 · Animal Behavior: Instinct and Learning
+2 moreBiology · L3 · Animal Behavior and Instinct
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Biology · L3 · Animal Behavior and InstinctCollection5 items
01Biology · L3 · What Is Cloning?
02Biology · L3 · Genetically Modified Organisms (GMOs)
03Biology · L3 · Cloning and GMOs Quiz
+2 moreBiology · L3 · Biotechnology Basics
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Biology · L3 · Biotechnology BasicsCollection5 items
01Biology · L3 · Asthma: Causes and Triggers
02Biology · L3 · Smoking, Chronic Lung Disease, and Pneumonia
03Biology · L3 · Respiratory Disorders Quiz
+2 moreBiology · L3 · Respiratory Disorders
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Biology · L3 · Respiratory Disorders