Life Cycles

All living things go through changes as they grow and develop. Although individual organisms die, new ones replace them, ensuring the survival of the species. During its life cycle, an organism goes through physical changes that allow it to reach adulthood and produce new organisms. Since these changes are common within a species, they can be grouped into stages of development. The unit Life Cycles addresses the life cycles of plants and animals, including humans.

Overview Resources

Print Unit Guide PDF Project Unit Guide
Unit Guide
Print Unit Resource List PDF Project Unit Resource List
Unit Resource List
Print NGSS Correlations Chart PDF Project NGSS Correlations Chart
NGSS Correlations Chart

Print Life Cycles Unit Roadmaps PDF Project Life Cycles Unit Roadmaps
Life Cycles Unit Roadmaps

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Read-First Model

In the read-first model, students begin by reading texts that help them build a foundation of understanding with the core science ideas of the unit. Then they engage in hands-on investigations and use other resources to explore examples related to the concepts they read about. Students learn about general concepts before using deductive reasoning to apply them to specific examples.

Vocabulary resources can be used at multiple points throughout the unit to develop and strengthen students� fluency with the disciplinary language of science. TIP: Challenge students to maintain a concept web throughout the unit that connects the examples they explore later in the roadmap back to the core ideas they read about in the Unit Nonfiction Book.

Start Here
Generate Interest
Unit Guide
spark activity Quick Reads
Core Text
Unit Nonfiction Books
Apply Concepts
Process Activity
Dig Deeper
FOCUS Books Investigation Pack Science Videos
Extend The Learning
Career Files Debate Reading A-Z Books*

* Each unit includes one free book from Reading A�Z. To access other titles related to the science topic, a subscription to Reading A�Z or Raz-Plus is required.

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Do-First Model

In the do-first model*, students are immersed in unit concepts by completing hands-on investigations that allow them to apply science and engineering practices and construct their own explanations of core ideas. Then students read texts, watch videos, and complete more investigations that help them confirm or refine their explanations. Vocabulary resources can be used at multiple points throughout the unit to develop and strengthen students� fluency with the disciplinary language of science. TIP: Have students use a science journal to record the examples they explore through activities and readings, then challenge them to design a concept web that connects those examples to the core ideas they read about in the Unit Nonfiction Book toward the end of the roadmap.

Start Here
Generate Interest
Unit Guide
spark activity
Lead Investigations
Process Activity FOCUS Books
Dig Deeper
Quick Reads Investigation Pack Science Videos
Core Text
Unit Nonfiction Books
Extend The Learning
Career Files Debate Reading A-Z Books**

* This model may also be referred to as the discovery method, in which students use inductive reasoning to determine broad concepts by first exploring examples.
** Each unit includes one free book from Reading A�Z. To access other titles related to the science topic, a subscription to Reading A�Z or Raz-Plus is required.

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Project-Based Model

In the project-based model*, students work in teams to investigate a science question or design a solution to an engineering challenge. The PBL Project Organizer, SAZ Journal, completed project, and group presentation all allow students to demonstrate what they have learned and accomplished. The PBL Teaching Tips help teachers facilitate the project, while rubrics for teachers and students can be used to assess group and individual performance. During planning and execution, students use other unit resources to build their understanding of core concepts that they can apply to their project.

Start Here
Generate Interest
Unit Guide
spark activity
Project-Based Learning Pack
Unit Nonfiction Books Investigation Pack FOCUS Books Game Pack/ Image Cards Vocabulary Cards Science Videos Quick Reads Process Activity
Additional Resources
Career Files Debate Word Work Reading A-Z Books**

* This model is sometimes referred to as a problem-based approach to learning, in which the objective is to solve a problem. In Science A-Z Project-Based Learning Packs, students do both�solve a problem and produce a product.
** Each unit includes one free book from Reading A�Z. To access other titles related to the science topic, a subscription to Reading A�Z or Raz-Plus is required.

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Life Cycles

Read-First Model

Generate Interest

Core Text

Apply Concepts

Dig Deeper

Extend The Learning

Do-First Model

Generate Interest

Lead Investigations

Dig Deeper

Core Text

Extend The Learning

Project-Based Model

Generate Interest

Project-Based Learning Pack

Additional Resources

Unit Nonfiction Books

Life Cycles

Lesson Resources

Process Activities

Human Life Cycle Sequence

Inherited Traits

Life Cycles of Edible Plants

Mealworm Life Cycles

FOCUS Books

The Mermaid's Purse

Inheriting Stripes

Life in the Pouch

Maggots, Grubs, and Nymphs

Pollywogs and Friends

Hot and Cold Reptiles

Veligers and Polyps

Supporting Materials

Investigation Packs

I.Files

Frogs

Elephants

Moths

Parrots

Trees

Barnacles

Mystery File

Dragonfly Naiads

Science Fair Resources

Science Fair Project Ideas

Debates

Adopting a Pet

Science Videos

Bees' Disease

Blue Butterfly Life Cycle

Butterfly Life Cycles

Comparing Life Cycles

Moms Who Listen

Plant Life Cycles

Career Files

Fish Hatchery Worker; Dog Breeder; Seed Farmer

Quick Reads

Extreme Life Cycles

Extreme Life Cycles

Extreme Life Cycles

Green Sea Turtles

Green Sea Turtles

Green Sea Turtles

Honeybees

Honeybees

Honeybees

Maple Seeds

Maple Seeds

Maple Seeds

Mendel's Pea Plants

Mendel's Pea Plants

Mendel's Pea Plants

Salmon

Salmon

Salmon

Reading A-Z Books

The Mighty Saguaro Cactus - Level U

Graphic Organizers

Venn Diagram