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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
Collection5 items
01Biology · L1 · Losing Baby Teeth
02Biology · L1 · Adult Teeth Grow In
03Biology · L1 · Baby Teeth and Adult Teeth Quiz
+2 moreBiology · L1 · Baby Teeth and Adult Teeth
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Biology · L1 · Baby Teeth and Adult TeethCollection5 items
01Biology · L1 · How Pollen Travels
02Biology · L1 · Bees, Butterflies, and Mutualism
03Biology · L1 · Bees, Butterflies, and Flowers Quiz
+2 moreBiology · L1 · Bees, Butterflies, and Flowers
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Biology · L1 · Bees, Butterflies, and FlowersCollection5 items
01Biology · L1 · Different Ways Parents Care for Babies
02Biology · L1 · Nursing, Feeding, and Teaching Baby Animals
03Biology · L1 · How Animal Parents Care for Their Young Quiz
+2 moreBiology · L1 · How Animal Parents Care for Their Young
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Biology · L1 · How Animal Parents Care for Their YoungCollection5 items
01Biology · L1 · Whales and Dolphins Have Lungs
02Biology · L1 · Diving and Holding Their Breath
03Biology · L1 · Why Whales Must Surface to Breathe Quiz
+2 moreBiology · L1 · Why Whales Must Surface to Breathe
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Biology · L1 · Why Whales Must Surface to BreatheCollection5 items
01Biology · L1 · Nests, Burrows, and Shells
02Biology · L1 · Webs, Hives, and Dams
03Biology · L1 · Animal Homes Quiz
+2 moreBiology · L1 · Animal Homes: Nests, Burrows, Shells, and Webs
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Biology · L1 · Animal Homes: Nests, Burrows, Shells, and WebsCollection5 items
01Biology · L1 · Runners and Bulbs
02Biology · L1 · Growing New Plants from Cuttings
03Biology · L1 · How New Plants Grow Without Seeds Quiz
+2 moreBiology · L1 · How New Plants Grow Without Seeds
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Biology · L1 · How New Plants Grow Without SeedsCollection5 items
01Biology · L1 · Match the Sound to the Animal
02Biology · L1 · Why Animals Make Sounds
03Biology · L1 · Animal Sounds in Nature Quiz
+2 moreBiology · L1 · Animal Sounds in Nature
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Biology · L1 · Animal Sounds in NatureCollection5 items
01Biology · L1 · Annual and Perennial Plants
02Biology · L1 · Biennial Plants and Comparing Lifespans
03Biology · L1 · How Long Do Plants Live? Quiz
+2 moreBiology · L1 · Annual and Perennial Plants
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Biology · L1 · Annual and Perennial PlantsCollection5 items
01Biology · L1 · Roots, Stems, and Leaves We Eat
02Biology · L1 · Fruits and Seeds We Eat
03Biology · L1 · Plant Parts We Eat Quiz
+2 moreBiology · L1 · Plant Parts We Eat
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Biology · L1 · Plant Parts We EatCollection5 items
01Biology · L1 · Warm-Blooded Animals
02Biology · L1 · Cold-Blooded Animals
03Biology · L1 · Warm-Blooded and Cold-Blooded Animals Quiz
+2 moreBiology · L1 · Warm-Blooded and Cold-Blooded Animals
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Biology · L1 · Warm-Blooded and Cold-Blooded AnimalsCollection5 items
01Biology · L1 · Special Group Names
02Biology · L1 · Why Animals Live in Groups
03Biology · L1 · Animal Groups: Herds, Flocks, Packs, and Schools Quiz
+2 moreBiology · L1 · Animals That Live in Groups
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Biology · L1 · Animals That Live in GroupsCollection5 items
01Biology · L1 · Plants Grow Toward the Light
02Biology · L1 · Plants and Sunlight
03Biology · L1 · Plants Grow Toward the Light Quiz
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Biology · L1 · Plants Grow Toward the LightCollection5 items
01Biology · L1 · Meet the Ant Colony
02Biology · L1 · Every Ant Has a Job
03Biology · L1 · How Ants Work Together Quiz
+2 moreBiology · L1 · How Ants Work Together
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Biology · L1 · How Ants Work TogetherCollection9 items
01Biology · L2 · Cells: Life's Building Blocks
02Biology · L2 · Food Chains and Food Webs
03Biology · L2 · Parts of an Animal Cell
+6 moreBiology · L2 · Cells & Food Webs
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Biology · L2 · Cells & Food WebsCollection4 items
01Biology · L2 · Shared Organelles: Plant and Animal Cells
02Biology · L2 · What Makes Plant Cells Different
03Biology · L2 · Cell Structure and Organelles Quiz
+1 moreBiology · L2 · Cell Structure and Organelles
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Biology · L2 · Cell Structure and OrganellesCollection5 items
01Biology · L2 · Digestive Organs and Their Jobs
02Biology · L2 · Breaking Down and Using Food
03Biology · L2 · The Digestive System
+2 moreBiology · L2 · The Digestive System
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Biology · L2 · The Digestive SystemCollection5 items
01Biology · L2 · The Heart
02Biology · L2 · Blood and Blood Vessels
03Biology · L2 · Simplified Blood Flow Loop
+2 moreBiology · L2 · The Circulatory System
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Biology · L2 · The Circulatory SystemCollection5 items
01Biology · L2 · Respiratory Organs
02Biology · L2 · How Breathing Works
03Biology · L2 · The Respiratory System
+2 moreBiology · L2 · The Respiratory System
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Biology · L2 · The Respiratory SystemCollection4 items
01Biology · L2 · The Skeleton
02Biology · L2 · Muscles at Work
03Biology · L2 · Bones and Muscles
+1 moreBiology · L2 · Bones and Muscles
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Biology · L2 · Bones and MusclesCollection5 items
01Biology · L2 · The Brain
02Biology · L2 · Nerves and Reflexes
03Biology · L2 · A Simple Reflex Path
+2 moreBiology · L2 · Brain and Nerves
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Biology · L2 · Brain and NervesCollection4 items
01Biology · L2 · Inherited vs. Learned Traits
02Biology · L2 · Family Resemblance Basics
03Biology · L2 · Traits and Heredity Quiz
+1 moreBiology · L2 · Traits and Heredity
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Biology · L2 · Traits and HeredityCollection4 items
01Biology · L2 · The Five Kingdoms
02Biology · L2 · Why We Classify Living Things
03Biology · L2 · Classifying Living Things Quiz
+1 moreBiology · L2 · Classifying Living Things
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Biology · L2 · Classifying Living ThingsCollection4 items
01Biology · L2 · Bacteria: Helpful and Harmful
02Biology · L2 · Viruses and Fungi
03Biology · L2 · Bacteria, Viruses, and Fungi Quiz
+1 moreBiology · L2 · Tiny Living Things: Bacteria, Viruses, and Fungi
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Biology · L2 · Tiny Living Things: Bacteria, Viruses, and FungiCollection5 items
01Biology · L2 · Roots, Stems, and Leaves
02Biology · L2 · Flowers, Pollination, and Seeds
03Biology · L2 · Plant Structures and Reproduction Quiz
+2 moreBiology · L2 · Plant Structures and Reproduction
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Biology · L2 · Plant Structures and ReproductionCollection4 items
01Biology · L2 · Ecosystem Vocabulary: Smallest to Biggest
02Biology · L2 · Major Biomes of the World
03Biology · L2 · Ecosystems and Habitats Quiz
+1 moreBiology · L2 · Ecosystems and Habitats
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Biology · L2 · Ecosystems and HabitatsCollection4 items
01Biology · L2 · Physical Adaptations
02Biology · L2 · Behavioral Adaptations
03Biology · L2 · Adaptation and Survival Quiz
+1 moreBiology · L2 · Adaptation and Survival
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Biology · L2 · Adaptation and SurvivalCollection5 items
01Biology · L2 · The Stages of Human Life
02Biology · L2 · Comparing Growth Across Animals
03Biology · L2 · Human Life Stages Quiz
+2 moreBiology · L2 · Growing Up: Human Life Stages
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Biology · L2 · Growing Up: Human Life StagesCollection5 items
01Biology · L2 · Germs: Bacteria and Viruses
02Biology · L2 · Your Body's Defenses
03Biology · L2 · Germs and Your Immune System Quiz
+2 moreBiology · L2 · Germs and Your Immune System
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Biology · L2 · Germs and Your Immune SystemCollection5 items
01Biology · L2 · The Eye: Structure and Vision
02Biology · L2 · The Ear, Skin, and Other Senses
03Biology · L2 · Sense Organs Quiz
+2 moreBiology · L2 · Sense Organs
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Biology · L2 · Sense OrgansCollection5 items
01Biology · L2 · The Skin: An Organ That Protects and Cools
02Biology · L2 · Kidneys and the Urinary System
03Biology · L2 · Skin and Kidneys Quiz
+2 moreBiology · L2 · Skin and Kidneys
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Biology · L2 · Skin and Kidneys