NGSS 3-LS1-1

Science3rd GradeFrom Molecules to Organisms: Structures and Processes

The Standard

Develop models to describe that organisms have unique and diverse life cycles but all have in common birth, growth, reproduction, and death.

Next Generation Science Standards

Teacher's field guide

What Students Need to Do: Students build diagrams, picture sequences, or physical models showing how organisms change over their lives. They use arrows and labels to compare cycles and show how each new generation repeats the pattern.
What Mastery Looks Like: A student can correctly sequence and label the life cycle of an animal and a flowering plant. They can explain similarities, differences, and how offspring begin another cycle.
Common Misconceptions: Students may think metamorphosis happens in every animal, or that a seed is not alive. They may stop the cycle at adulthood, confuse growth with reproduction, or assume offspring look exactly like adults.
How to Assess It: Complete butterfly and bean plant life cycle diagrams with arrows and missing stages. Write one way the cycles differ and one pattern they share.

Lesson moves

Give groups butterfly, frog, chicken, and sunflower stage cards to arrange in circles, then connect each stage with yarn and arrows.
Ask students to write: How is a sunflower’s life cycle like a butterfly’s, and what change is unique to each?
Play Life Cycle Relay: teams race to order picture cards, add arrows, and explain why the final card links to the first.
Observe flowering plants in the schoolyard, photograph visible stages, and build a class timeline that predicts what each plant will do next.

Free download

A ready-to-print activity worksheet aligned to 3-LS1-1, with an answer key for the teacher on its own page. No account needed.

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Learning progression

Mastery here sets students up for these next.

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